Answer:
O The number of valence electrons increases from left to right.
Explanation:
In general, the number of valence electrons is the same within a column/group. When the group number increases, the # of valence electrons also increases.
The option correctly describes the pattern of valence electrons on the periodic table is the number of valence electrons increases from left to right. Thus, option D is correct.
What is atomic mass?In universe every particle have some mass associated with it whether it is small or large. According to Dalton's theory of atomic structure every particle is made up of with atoms. The average mass of atomic particle is called as atomic mass. This is commonly calculated as per international agreement in terms of a unified atomic mass (amu).
It can also be defined as 1/12 of the mass of a carbon atom-12 in its ground state. The mass of atom can also be calculated as the mass of protons and neutrons which almost equal to atomic mass. This small change is due to the binding energy mass loss.
Calculation:-
As per given above question:-
99% H-1
0.8% H-2
0.2% H-3
So,
Atomic mass = (99x1 + 0.8x2 + 0.2x3)÷100%
Atomic mass = 1 amu,
Therefore, The option correctly describes the pattern of valence electrons on the periodic table is the number of valence electrons increases from left to right. Thus, option D is correct.
Learn more about atomic number here:
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Which statement below describes a physical property of a substance?
A. Helium gas floats because is less air dense than air
B. Sulfuric acid is a toxic liquid
C. Iron rusts when exposed to water and air
D. Sodium metal explodes when exposed to water
Answer:
A
Explanation:
Because density is a physical property and the rest are all chemical properties
Answer:
A
Explanation:
What is the name of this unstable isotope from number 9?
Answer:
Xenon
Explanation:
Xenon is the unstable isotope element from number 9
what is the acceleration of 1 m/s?
Answer:
Newton es la fuerza que provoca una aceleración de 1 m/s2 en un cuerpo de 1 kg. La segunda ley de Newton establece que la fuerza y la aceleración son directamente proporcionales, pero no hay que olvidar el efecto de la masa.
Explanation:
pls help me also pls have the correct answer
Answer:
Explanation:
“name each season from the diagram above.” PLEASE HELP I WASNT AT SCHOOL.
Answer:
to be honest I don't know
Explanation:
Answer:
A- Summer E- Winter
B- Spring F- Fall
C- Winter G- Summer
D- Autumn/Fall H- Spring
Explanation:
*WARNING* I don't know for a fact but i think this is the answer
Which is a limitation of comparative investigations?
They give results that are usually not repeatable by other scientists.
They might show variable relationships that are not actually cause and effect.
They can usually only be conducted in labs instead of in natural environments.
They are usually inexpensive, but they do not provide new information.
Answer:
hi............
Explanation:
What is the basic building block of all pure substances that make up matter in the world? A. atoms B. cells C. compounds
Answer:
a) Atoms
Explanation:
All of the following are forms of energy EXCEPT: A) heat B) friction C) light D) electrical
Answer:
Friction
Explanation:
Friction make heat energy its not a energy it self just a force
Answer:
Friction
Explanation:
Friction is only the resistance that one surface or object encounters when moving over another
help quick............
Atomic number: 42
Chemical symbol: Molybdenum (Mo)
Number of protons: 96
Atomic mass: 96
Number of electrons: 42
Number of valence electrons: 5
Number of electrons in the n=3 shell: 42
Number of neutrons: 54
Use the information and data from the tests to make a recommendation for which blanket the government should choose. In your response include scientific reasoning to support your recommendation.
Reasoning: Explain using scientific principles and connect the test results to the criteria and constraints.
Answer:
through the day yesterday and I was really hoping to see you and
How do planets with larger masses apply greater gravitational forces on objects compared to planets with less mass?
Answer:
more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
What is the best description of how heat is transferred from deep in the earth to the surface?
a. Conduction brings hot magma up through the mantle toward the crust, where it cools and sinks.
b. Convection brings hot magma up through the mantle toward the crust, where it cools and sinks.
c. Convection brings hot magma up from the core to the crust, where it cools and sinks.
d. Conduction brings hot magma up from the core to the crust, where it cools and sinks.
Answer:
pretty sure it's C,
Explanation:
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. ... This hot added material cools down by conduction and convection of heat.
Buffalo, New York is a city located near a large lake called Lake Erie. Buffalo receives an average of nearly 94 inches of snowfall a year. Using your knowledge of temperature and what you have read, explain why Buffalo receives so much snow.
Answer: it is further away from the equator
Explanation:
The simple answer to why Buffalo receives so much snow, and why it is is often confined to a specific area, is lake effect snow. Lake effect snow occurs most frequently during cold snaps in early winter. It happens when the transfer of heat and moisture from the warm waters of the Great Lakes to the cold air creates a shallow layer of atmospheric instability, causing air to rise quickly. As the moisture rises and condenses, it begins to fall as snow–and often, a lot of snow. Depending on which direction the winds are blowing, areas in the snow belts near the Great Lakes (including Buffalo) can see several feet of snow in just a few days. According to the National Weather Service, in the Buffalo area, when cold air from Canada moves over the still unfrozen, relatively warm Great Lakes, the lake moisture and instability from this temperature contrast build one or more bands of snow. These bands are then deposited over locations downwind from the lakes, with some areas receiving much more snow than others, depending on their location and the wind direction.
A student passes a magnet over 10 grams of a powder. Four grams of the powder stick to the magnet, while 6 grams do not .which of these identifies the substance?
What kind of spider has red legs & a black body? I just saw this kind of spider past by my window-
Answer:
red legged purseweb spider
Explanation:
Will not cause death but still stay away if you are sensative to all spiders.
Brainliets and a lot of points to ever answers all questions and get all right
1.What are the 2 types of cells (not plant and animal)? Describe each type.
2.Are you made of prokaryotic or eukaryotic cells? Explain why you chose your answer.
3.Are bacteria prokaryotic or eukaryotic? Explain why you chose your answer.
4.What parts do all cells have in common? List at least 2.
Label the numbered parts of the cell:
pic downloaded below
8. __________________
9. _________________
12. Using the onion cell diagram above, which organelle is responsible for the greenish color?
13. Which organelle is the red arrow pointing towards?
14. Both plant and animal cells contain mitochondrion however they are not in equal amounts.
Between the cheek and onion cells, which one do you think would contains the greater amount of mitochondrion and
why?
15. Compare in your own words, at least 2 differences in plant and animal cells.
16. Why does a plant cell need a larger vacuole?
17. Animal cell do not have chloroplasts. Why not?
18. What are the 3 components of the cell theory? Put in your own words.
19. Choose one part of the Cell Theory and describe an experiment you could do that would give evidence to support your claim.
20. How can a microscopic paramecium and a large giraffe both be described by the cell theory?
Pls, Help! 35 Points!
How can geothermal energy be used?
A fuel vehicles
B capture solar power
C power hybrid vehicles
D generate electricity
Answer:
generating electricity hope this helps have a nice day ;)
Explanation:
Answer:
d
Explanation:
Identify the form of energy.
mechanical energy
chemical energy
radiant energy
electrical energy
Answer:
Mechanical energy
Explanation:
Your body is doing most of the work
Try to make it that force of friction is so much that the object's cannot be accelerated.
How can you do this?
Answer:
high gravity I hope it helps ️
Explanation:
High gravity mean's high fraction
The atomic number of an element:
Question 2 options:
Tells you the mass of the atom
Tells you the number of energy levels there are around the atom
Tells you the identity of the atom
Tells you how many valence electrons the atom has
all are the following forms of energy EXCEPT:
(A)heat
(B)friction
(C)light
(D)electrical
describe the relationship between the mass of the ice and the transfer of thermal energy in the investigation. Use evidence and scientific reasoning to support your answer. (Use the following words: Molecules, Kinetic Energy, and Heat.
PLEASE HELP
Answer:
Explanation: 1234456
PLS ANSWER ASAP
Global winds affect weather patterns around the world. What are the names of the three types of global winds shown in the diagram?
A) A are polar easterly winds B are trade winds, and C are gulf winds.
B) A are north winds, B are prevailing westerly winds, and C are polar easterly winds.
C) A are north winds, B are west winds, and C are east winds.
D) A are polar easterly winds, B are prevailing westerly winds, and C are trade winds.
Answer:
answer is C!!
Explanation:
When an Alka-Seltzer® tablet is put in water, there is a chemical change because there are bubbles produced. The Alka-Seltzer® tablet slowly disappears over time. What would speed up the chemical change?
Adding more water would cause the chemical change to speed up.
Changing the color of the tablet would cause the chemical change to speed up.
Decreasing the temperature of the water would cause the chemical change to speed up.
Increasing the temperature of the water would cause the chemical change to speed up.
A rock is taken from the Moon back to Earth. Which of the following correctly
describes the changes to its mass and weight?
a. Its mass has no change, and its weight decreases.
b. Its mass has no change, and its weight increases.
c. Its mass decreases, and its weight has no change.
d. Its mass increases, and its weight increases
The mass of the rock remains unchanged, and its weight increases.
What is Weight ?
Weight is the force exerted by the earth on an object at the surface of the earth. Mathematically -
W = m x g
where -
m is the mass of object
g is acceleration due to gravity
Given is a rock is taken from the Moon back to Earth.
Mass and weight are completely different from each other. Mass is the amount of matter present inside the body whereas weight is the force exerted by earth on any object on its surface. Mathematically -
W = mass x acceleration due to gravity
W = Mg
The ratio of Weight to mass is [g] (9.8).
W/M = g
Mass of a body remains constant throughout the universe but its weight depends upon the value of acceleration due to gravity of the environment of the planet or any other celestial body in which it exists. Hence, because of this only, the mass of rock remains same but its weight increases as it is brought back to earth since the acceleration due to gravity on earth is greater than that on moon.
Therefore, the mass of the rock remains unchanged, and its weight increases.
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Throughout the investigation the ice begins to melt. This is because the thermal energy of the water ___while the thermal energy of the ice ____, causing it to melt.
First Blank: decreases
Second Blank: Increases
An element can be separated into simpler substances by
a. physical means
b. chemical means
c. both physical and chemical means
d. neither physical nor chemical means
pls help me with this pls don't just come to my question with out answering the questions
A chemical equation calls for 2 water molecules. How many of each atom would be in this formula of 2H20?
2 Hydogen atoms and 2 oxygen atoms
4 Hydrogen atoms and 4 oxygen atoms
4 Hydrogen atoms and 2 oxygen atoms
Answer:
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and i want brainliest please
Explanation:
The forces exerted on an object are shown.
help asap!!!!! (i will mark brainliest)
A box has an arrow pointing down labeled F and an arrow pointing up labeled 5 N.
Which of the following happens when F is less than 5 N?
The object moves up.
The object moves down.
Balanced forces keep the object stationary.
Balanced forces keep the object's speed constant.
Answer:
The object moves up.
Explanation:
I think that's the answer because since F was up that would cause 5 N . To go up.
Tell me if I'm wrong, plz :D
Answer:
The object moves up