To solve this problem, you can use the following formula:
M = m/V
where M is the molarity of the solution, m is the mass of the solute, and V is the volume of the solution. In this case, you are given the molarity and the mass of the solute, and you need to find the volume of the solution.
Substituting the given values into the formula and solving for V, you get:
V = m/M = (18.0 g) / (0.405 M) = 44.3 mL
So, you need 44.3 mL of the solution to obtain 18.0 g of oxalic acid.
when the elements are arranged in order of increasing number of protons, certain sets of properties recur periodically. true or false
True, According to Mendeleev's periodic table when atoms are arranged in increasing no. of atomic mass some properties recur periodically, which later changed to the modern periodic law.
What is a Modern Periodic Table?According to the contemporary periodic law, an element's physical and chemical characteristics are periodic functions of its atomic number.
From left to right across each row, scientists organized elements in increasing order of their atomic numbers. and found that items with identical features recur at predictable periods.
Thus, according to modern periodic law when elements are arranged in increasing order of atomic no. certain physical and chemical processes. recur periodically.
True, According to Mendeleev's periodic table when atoms are arranged in increasing no. of atomic mass some properties recur periodically, which later changed to the modern periodic law.
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Why is it important to conduct multiple trials of an investigation to determine the melting point of ice?(1 point).
It is important to conduct multiple trials of an investigation to determine the melting point of ice in order to ensure accuracy and to account for any small variations or errors that may occur.
What is investigation?
Finding the response to a question using a variety of research techniques is the process of conducting a scientific investigation. An investigation typically starts when a person observes their surroundings and poses questions they are unsure of the answers to. After that, they conduct additional observations or design an experiment to verify a theory. The researcher could indeed present findings that make an attempt to address their questions by gathering and analysing data. The experiment may be changed by the researcher to test for variables they hadn't originally thought of. A scientific investigation's primary goal is to advance knowledge. Researchers can discover explanations for natural phenomena through research and experimentation, and they can then use their discoveries to address issues in the real world.
Melting point is an important physical property of a substance and accurate measurements are necessary for many scientific experiments. Conducting multiple trials and averaging the results will help to reduce the impact of any errors and ensure the most accurate measurement of the melting point.
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Electrical Bonding Evidence Quick Check:
1. Melting point, boiling point, surface tension, and vapor pressure (D)
2. Deciding on the appropriate equipment (C)
3. Mix ice with water until equilibrium is reached but some ice remains that is no longer melting (B)
4. It ensures that results are accurate (A)
5. The student should take the average of the results from all four trials (D)
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These are all 100%! I just took the test and all my answers were correct! Hope this helps you <3
a30.0-g sample of water at 280.k is mixed with 50.0g of water at 330. k. calculate the final temperature of the mixture assuming no heat loss to the surroundings.
The mass and temperature of the first container are multiplied together, and the result is added to the product of the mass and temperature of the second container to get the water temperature of the combination.
After that, divide the result by the total water masses in each container.
What factors contribute to the calorimeter's heat capacity?The amount of heat that the calorimeter can hold for each degree Celsius increase in temperature is known as its heat capacity.
Experimental analysis is required to determine the calorimeter's heat capacity. Studying how warm and cold water are combined is the simplest technique.
Since we are aware that the final amount of our dilution will be 150mL.
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When 1711 J
of heat energy is added to 43.2 g
of hexane, C6H14,
the temperature increases by 17.5 ∘C.
Calculate the molar heat capacity of C6H14.
The molar heat capacity of ethanol is 107 J⋅°C-1mol-1.
What is Molar Heat Capacity?
The amount of heat required to raise the temperature of 1 mole of a substance by 1 unit is known as the molar heat capacity, which is calculated by dividing heat capacity by the total number of moles.
The quantity and size of the substance have an impact on heat capacity, a complex property. A modified notion known as specific heat capacity, or just specific heat, is commonly used in physics. Because it is unaffected by the quantity of the substance, specific heat is a more useful characteristic.
The term "specific heat" refers to the amount of energy required to increase a substance's mass by one unit of temperature. It can be calculated quantitatively as the heat capacity of a substance divided by its mass.
q = amount of heat transferred
n = number of moles
c = molar heat capacity
ΔT = change in temperature
q=ncΔT
The molar heat capacity of ethanol is 107 J⋅°C-1mol-1.
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If 75. 0 ml of a 0. 20 m solution of sodium nitrate is mixed with 25. 0 ml of a 0. 10 m solution of barium nitrate, what is the molar concentration of nitrate ions in the resulting solution?.
The molar concentration of nitrate ions in the resulting solution is 0.20M.
What is molar concentration?Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
Now let us come to our problem statement;
Nitrate from NaNO₃:
75.0 mL × 0.20 M = 15 mmol NaNO₃ = 15 mmol NO₃⁻
Nitrate from Ba(NO₃)₂:
25.0 mL × 0.10 M = 2.5 mmol Ba(NO₃)₂
2.5 mmol Ba(NO₃)₂ × [tex]\frac{2mmol NO3}{1mmol Ba(NO3)2}[/tex] = 5.0 mmol NO₃⁻
So the final number of NO₃⁻ moles is (15 + 5) 20 mmol.
The final volume is (75 + 25) 100 mL.
So the molar concentration is:
20 mmol / 100 mL = 0.20 M
The molar concentration of nitrate ions in the resulting solution is 0.20M.
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to what volume should you dilute 30 ml of a 12 m h2so4 solution to obtain a 0.15 m h2so4 solution?
The volume will be 2400 ml.
The equation used here will be
M1 × V1 = M2 × V2
M1 = initial concentration
M2 = final concentration
V1 = initial volume
V2 = final volume
So according to the data;
M1 = 12m
M2 = 0.15m
V1 = 30ml
V2 = ?
By putting the values in the equation as follows;
M1 × V1 = M2 × V2
V2 = M1 × V1 / M2
By putting the values given in the question we will solve this question as follows
V2 = 12 × 30 / 0.15
V2 = 360 / 0.15
So the volume used will be;
V2 = 2400 ml
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alkenes can be used as substrates in polymer synthesis. consider cationic polymerization and determine which substitution pattern would be the best substrate?
Cationic polymerization is a form of chain-growth polymerization used in chemistry, in which a cationic initiator charges up a monomer before it reacts.
What are they Cationic and anionic polymerization?The two different forms of chain-growth polymerization reactions utilized to create various types of polymers are anionic polymerization and cationic polymerization. Both of these reactions have the same reaction mechanism, however they have distinct reaction initiators.
What separates cationic from anionic substances?Ions with a positive charge are called cations . Anions are negatively charged ions that have gained one or more electrons, resulting in having more protons than electrons.
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Provide an orbital energy level diagram for the ground state of a nitrogen atom
An orbital energy level diagram for the ground state of a nitrogen atom is option A is correct.
What is energy level diagram?Energy level diagram is defined as a visual representation of the energies of an atom's or molecule's various orbitals. The energy shifts when it switches between energy levels or when it jumps to a different shell. As a result, a shell also indicates an electron's energy along with its location, and these are known as energy levels.
Seven electrons make up the atom of nitrogen. Let's write the orbital notation of the atom in order to build the orbital energy level diagram: 7 electrons of nitrogen:
1s² 2s² 2p³
Thus, an orbital energy level diagram for the ground state of a nitrogen atom is option A is correct.
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Roxanne was asked by her teacher to explain why sodium ions (na+) and chlorine ions (cl-) combine into sodium chloride (nacl). Roxanne said it was because chlorine is highly electronegative and sodium has a low ionization energy. What else could she include in her explanation?.
She could say, "Tons with oppositely charged of Cl- and Na+ are electrical attracted to each other," in her explanation.
Na+ is a sort of ion, right?The main extracellular cationic and solute is sodium ion (Na+), which is crucial for the production of nerve impulses in cardiac and neurological tissue.
What function does Na+ serve?The predominant cation in extracellular environment is the sodium ion (Na+). Na+ can function as an essential intracellular second messenger upon entry into the cell, regulating a variety of cellular processes. Recent research has demonstrated that extracellular Na+ can play a significant signaling role in the up-regulation of Command is executed.
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Which model of an atom accounted for the mass of the atom and a balanced charge
Answer: The Rutherford model.
Explanation:
If magneium burn in oxygen, the ratio i 3 ma unit of oxygen to form 5 ma unit of magneium oxide. How many gram of oxygen are needed to react with 6 gram of magneium?
Answer: 4
Explanation:
how many milliliters of 10.5 m hcl(aq)10.5 m hcl(aq) are needed to prepare 205.0 ml205.0 ml of 1.00 m hcl(aq)?
The milliliters of 232 quantity of HCl required for preparing 1M HCl.
The fact that water has a concentration of 10-7 for both hydronium and hydroxide must be taken into account when the concentration of acids very close to or less than 10⁻⁷.
We frequently overlook the ion concentration in water for the same reason that we frequently ignore the mass of electrons (we just add the protons and neutrons), which is that they are so minute. For taking the -log conc, there is an exception in this case.
M1 * V1 = M2 * V2
10.5 * V1 = 1 * 740
V1 = 70.48 ml
Initial moles of solute are calculated as follows: molarity * volume in liters = 12 * (61/1000) = 0.0732 moles.
The 238 ml of solution now contains these moles.
0.0732 moles are present in 238 ml of solution.
Therefore, 119 ml of solution will contain = 0.0732 * 119 / 238 = 0.0366 moles of solute.
As of right now, the solution's total volume is 119 /113 = 232 ml, or 0.232 liters.
Final concentration is equal to moles divided by the volume in liters, or 0.0366/0.232, or 0.158 M.
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Anlamadim yardım edin acil
Can u put the question in english
If a solution of NH3Br is cooled from 50 degrees Celcius to 10 degrees Celcius, what mass of crystals would form?
what grade is this for?
Explanation:
as the atomic number for elements on the periodic table increases, the number of electrons in neutral atoms of the elements______.
when 0.1 mol of a is mixed with 0.1 mol of b in the reaction chamber and the reaction runs to completion, the 1500 ml of water in the calorimeter heats up from 24.2°c to 25.9°c. what is δh° for the reaction in kj/mol?
Water has a 4.18 J/g specific heat capacity at 0 °C. Since 1500 ml of water weighs 1500 g, the enthalpy change for a 24.2 to 25.9 degree Celsius temperature difference is 10659 per mole or 1065.9 for 0.1 mol.
Describe calorimetry.Calculating a reaction's enthalpy change analytically is called calorimetry. Given by, is the calorimetric equation that links mass, temperature difference, and specific heat capacity (c).
q = mc ΔT
given that the water has a 1500 ml capacity. Since water has a density of 1 g/ml, its mass is 1500 g. Water has a specific heat capacity of 4.18 J/°C g. Therefore, the following formula is used to compute the thermal energy of the reaction:
q = 1500 g × 4.18 J/ °C g × (25.9 - 24.2 °C)
= 10659 J/mol
Hence, for 0.1 mol 10659 × 0.1 = 1065.9 J is the heat energy change for the reaction.
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Which of the following is part of the third step when using stoichiometry to go from grams of a reactant to grams of a product?
A) Mole ratio
B) Mass of product
C) Mass of reactant
D) Molar mass of reactant
The part of the third step when using stoichiometry to go from grams of a reactant to grams of a product is Mole ratio (option A).
What is stoichiometry?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
Stoichiometric problems involving reactants mass to products mass can be solved in four simple steps:
Balance the equation.Convert units of a given substance to moles.Using the mole ratio, calculate the moles of substance yielded by the reaction.Convert moles of wanted substance to desired units.This suggests that the third step when using stoichiometry to calculate grams of a reactant or grams of a product is to find the mole ratio.
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Answer:
To anyone who's wondering, the fourth step is
D. Molar mass of product
(I just took the test and got it right).
Explanation:
if the total atmospheric pressure is 1 atm, and it suddenly drops to 10% oxygen, then can you survive?
The option C , Yes ,if you hurry up and adapt (acclimate) within 2 minute holding your breath is correct answer.
The right amount of oxygen in blood is important. Too little oxgen and much oxgen are both harmful to health. Therefore, the body ciontrols and regulatesthe amount of oxygen in blood at all times ,and the levelof oxygen in blood drops too low , the condition is called hypoxemia.
The option A, say sudden drops (10%) of oxygen is not sustainable, it is wrong because of the decrease of oxgen level it create the breathning problem.
The option B,yes there is still lots of oxygen around, this option is correct the oxygen variation made many heath issues,but the option C is good answer for this question.
Option A is corect, countercurrent exchnge,,the two fluid moves in opposite direction with different heat,the maximum amount of heat transfer that can be obtained is higher incountercurrent, The countercurrent exchange is most suitable for urine purification,
Option B ,is wrong Concurrent exchange is two fluids moves in same direction it not gives 100%f freshwater
Urine treatment ; Heating the urine to evaporate the water and leaves the salt behind. The water vapor would then move to a condenser and be condensed as purified water .The salt remain, forming a brine solution with some of the remaining water. The brine would have to be recovered or thrown away periodically. this process would requires a lot of power to heat all the water boiling and to then cool the water vapor sufficiently to condensed it.
Option C: wrong Reverse osmosis.Using high pressure cross a very fine fitter or membrane to purify water.The water is separated from the salt Brine is created from the concentrated salt that have to be recoveredor periodically thrown away. This technology is often used in aridregion to convert and purify sea water into portable water.
Hence the option C is correct
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The formula of a base is written by showing the number of hydrogen ions needed to balance the positive charge on the cation. True or false
By indicating that the number of hydrogen ions required to balance the positive charge on the cation is True, the formula for a base can be written down.
In terms of H+ ions, what is a base?The hydroxyl ions (OH-) produced will mix with any hydrogen ions (H+) in the solution to generate water molecules (OH- + H+ = H2O), therefore we can also define a base as a substance that receives or accepts hydrogen ions (H+) that are already present in the solution.
A cation or an anion, is hydrogen?Hydrogen is an alkali metal with one electron in the outermost shell. It loses one electron to create a cation, H+, much like alkali metals.
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how do green plants use air water and sunlight to make food during photosynthesis our teacher asked
The plants received the same amount of sunlight and water each day. At the end of 30 days, Mary recorded the height of the plants (in centimeters) and the color of the leaves (green, yellow-green, yellow, or brown.)
1. In this scenario, what is the independent variable?
The leaves change within the season of spring,summer to fall
2. What is the dependent variable?
How the leaves change in time
3. In this scenario, what are the controlled variables? (Identify at least three.)
1. The green to brown leaves
2. The slow process of change
3. Nothing is bothering the leaves in the process of photosynthesis
4. Which group would be the control group in this experiment??
Fertilizer could be the independent variable in the plant experiment. Fertilizer will be applied to certain plants but not others. To study the impact on the dependent variable, the scientists alter the amount of the independent variable (fertilizer) (plant growth).
What independent variable includes in plant experiments?The amount of fertilizer applied would be the independent variable in a study examining the impact of various fertilizer dosages on plant growth. The plant's growth in height or mass would be the dependent variable.
Therefore, The experimenter manipulates or modifies the independent variable, which is thought to have a direct impact on the dependent variable.
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Fermentation is a chemical reaction that occurs in the. Because it is , fermentation oxygen. Compared to cellular respiration, lactic acid fermentation generates atp and is less efficient.
A chemical reaction that normally occurs in the cytoplasm of both prokaryotic and eukaryotic living cells is known as fermentation.
An anaerobic reaction is a biological or chemical process that doesn't need oxygen, such fermentation and glycolysis.
As a result, since fermentation is anaerobic, oxygen is not needed.
Lactic acid fermentation produces significantly less adenosine triphosphate (ATP) and is less effective than cellular respiration.
More high-energy intermediates that can be oxidized to produce adenosine triphosphate (ATP) are produced during cellular respiration than are produced during lactic acid fermentation.
In comparison to cellular respiration, lactic acid fermentation is often less effective and generates significantly less adenosine triphosphate (ATP).
As a result, the following phrases/words are the most suitable and accurate to fill in the blanks:
1) cytoplasm
2) Anaerobic
3) Does not require
4) Much less
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a certain stable nuclide, after absorbing a neutron, emits an electron, and the new nuclide splits spontaneously into two alpha particles. identify the nuclide.
certain stable nuclide, after absorbing a neutron, emits an electron, and the new nuclide splits spontaneously into two alpha particles. the nuclide.37 X
What are a nucleon and a nuclide?
Summary. Nucleons are the protons and neutrons that make up the nucleus. An atom with a certain number of protons and neutrons is referred to as a nuclide. When an unstable nucleus spontaneously decays, it becomes radioactive, and the emissions it produces are collectively referred to as radioactivity.
ZA
X+01
x→2 24
α+ −10 β
∴Z+0=4−1=3
A+1=8
∴
37 X
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in blood plasma, ph is maintained by the carbonic acid-bicarbonate buffer system. how is ph maintained when acid or base is added to the buffer system?
The blood interacts with the bicarbonate, C03²-, from the acid to balance it when acid is supplied to the blood buffer system.
How does a buffer system operate and what does it mean?A buffer is a substance that can withstand a pH shift when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the solution's pH level largely constant. For procedures and/or reactions that call for certain and stable pH ranges, this is significant.
Give an example of what a buffer system is.Buffer solutions can resist the pH change when a strong acid or base is added sparingly. A strong acid and also its salt can be used as a buffer. It is a mixture of sodium acetate and acetic acid, CH3COOH + CH3COONa.
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which pair of atoms forms the most polar bond? which pair of atoms forms the most polar bond? n and o n and f p and f p and o
The most polar form is made up of the elements phosphorous and fluorine. P-F because P(EN 2.19) and F(3.98) have higher electronegativity differences than N(EN 3.04) and F. (3.98).
The more polar the disparity, the greater it is.The bond that phosphorous forms with fluorine will be the most polar of all those mentioned because nitrogen is one of the most electronegative elements in the periodic table. Orbitals collide to form bonds, which can be classified as polar or nonpolar depending on their polarity. They are regarded as an ionic and covalent link in accordance with Fajan's rule, which explains the ionic and covalent character in a bond between two atoms. The difference in electronegativity between the two atoms that make up a bond determines its polarity. A nonpolar covalent bond will form between two atoms if their electronegativity is essentially the same.
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During one cycle, the sodium-potassium pump binds and moves.
1 Na+ and 2 K+.
2 Na+ and 2 K+.
2 Na+ and 3 K+.
3 Na+ and 2 K+..
3 Na+ and 3 K+
The sodium potassium pump transports Na+ out of the cell and K+ into the cell.
What is sodium potassium pump?Many cell or plasma membranes contain the sodium-potassium pump. The pump, which is powered by ATP, moves sodium and potassium ions in opposite directions, each against its concentration gradient.In a cycle of conformational (shape) changes, the sodium-potassium pump transports sodium out of and potassium into the cell. Three sodium ions leave the cell during each cycle, while two potassium ions enter.The ion-potassium pump is maintained by the sodium–potassium adenosine triphosphates, an enzyme that can be found in the membrane of animal cells and uses ATP to change Na+ (sodium) and K+ (potassium) concentrations inside and outside the cell. In its process, the enzyme pumps three Na+ ions from the inside to the outside of the cell, and also pumps two K+ from the outside to the inside of the cell. Therefore, the correct answer is B. It pumps 3 Na+ ions out of the cell for every 2 K+ ions it pumps into the cell.To learn more about sodium potassium pump, visit:
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Seeds are a derived character of the spermatophytes. All of the plants in this clade reproduce using seeds. However, embryo formation is also a trait of the spermatophytes. Do you think true water-conducting tissue is a derived character of either embryophytes or green algae? why or why not?.
Neither green algae nor embryophytes have a developed characteristic of having tissue that conducts water.
Embryophytes and aquatic "green algae" make up the majority of green plants.
Non-vascular plants lack the xylem and phloem that make up a vascular system.
Green algae are unable to grow as tall as the majority of vascular plants because they lack lignified water-conducting tissues.
What is xylem?
The vascular tissue is absent in green alge, which are divided into various unrelated families.
The majority of scientists believe that the xylem's real water conducting tissue is green. The tissue of the plant's vascula transports water and dissolved minerals from the roots to the rest of the plant while also offering structural support.
Tracheary elements are a general term for a variety of specialised water conducting cells found in xylem tissue.
Therefore, Green algae and embryophtes cannot be considered as both since they lack the xylem, a water-conducing tissue, and as a result cannot be both.
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The sodium-potassium pump functions to pump
sodium ions out of the cell and potassium ions into the cell.
sodium ions into the cell and potassium ions out of the cell.
sodium and potassium ions into the cell.
sodium and potassium ions out of the cell.
sodium and potassium ions in both directions across the cell membrane.
The sodium potassium pump helps in maintaining the acid-base balance of the body and helps in proper kidney function.
Explain about sodium-potassium pump:Operation sodium-potassium pump of moves sodium ions out of the cell and potassium ions into the cell. When a cell membrane moves molecules or ions against a concentration gradient or against an electrical or pressure gradient, the process is called active transport. Different substances that are actively transported include:
--> sodium ions,
--> potassium ions,
--> calcium ions and
--> some amino acids.
There are two types of active transport which are divided according to the energy that is used to cause the transport. They include:
--> primary and
--> secondary active transport.
PRIMARY ACTIVE TRANSPORT
A typical example is the SODIUM-POTASSIUM PUMP( Na+ - k+). This is a transport process that pumps sodium ions outward through the cell membrane of all cells and at the same time pumps potassium ions from the outside to the inside. This pump helps to:
--> maintain the sodium and potassium concentration differences across the cell membrane
--> establish a negative electrical voltage inside the cells.
The mechanism or operation of the pump involves the following steps:
--> two potassium ions bind on the outside of the carrier protein and three sodium ions bind on the inside.
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What is mAngleMHJ?
A boron atom contains 6 neutrons. This isotope of boron will have
protons and a mass number of
Answer: 5 and 11
Explanation:
protons= 5
neutrons=6
mass number= 6+5=11
Given a list of atomic model descriptions: a: electron shells outside a central nucleus b: hard, indivisible sphere c: mostly empty space which list of atomic model descriptions represents the order of historical development from the earliest to most recent?.
Earliest to Latest:
hard, indivisible spheres → mostly empty space → electrons shells outside a central nucleus
What are electron shells?
In chemistry and atomic physics, electron shells can be thought of as the orbits of electrons around the nucleus. The shells closest to the nucleus are ``1-shell'' (also called ``K-shell''), ``2-shell'' (or ``L-shell''), ``3-shell'' (or ``M-shell''), and so on. away The shells correspond to the principal quantum numbers (n = 1, 2, 3, 4...) or are labeled alphabetically with letters in X-ray notation (K, L, M,...). A useful guide to understanding the electron shells of atoms is to note that each row in the conventional periodic table of elements represents an electron shell.
What is nucleus?
The atomic number, or atomic number of a chemical element, is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons, or the number of protons found in the nucleus of each atom of that element.
Therefore, Earliest to Latest:
hard, indivisible spheres → mostly empty space → electrons shells outside a central nucleus
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