Chemistry High School

(60 points + brain list)
Which is the configuration of an atom in the ground state?
A)
2-8-2
B)
2-6-1
C)
2-7-2
D)
2-7-3

Answers

Answer 1

Answer:

Ground state means when n = 1

and here the electronic configuration is 2:8:2

Related Questions

A scientist has 207.45g of H2O in a beaker. How many water molecules are in the beaker?

Answers

Answer:

6.94 x 10²⁴molecules

Explanation:

Given parameters:

Mass of water  = 207.45g

Unknown:

Number of molecules  = ?

Solution:

To solve this problem, we must understand:

      1 mole of a substance  contains 6.02 x 10²³ molecules

Now, first find the number of moles of water;

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

 Molar mass of water  = 2(1) + 16  = 18g/mol

  Number of moles  = [tex]\frac{207.45}{18}[/tex]   = 11.53moles

So;

          1 mole of a substance  contains 6.02 x 10²³ molecules

       11.53moles of carbon dioxide will contain 11.53 x  6.02 x 10²³

                                                                 = 6.94 x 10²⁴molecules

What is period? A group?

Answers

wdym exactly? like a punctuation mark orrrr
A period is for girls and a group is where you hang out with ppl

true or false; some organisms are not affected by any abiotic factors

Answers

Answer:

True

Explanation:

Answer:

False

Explanation:

answers for both boxes please ​

Answers

Explanation:

[tex] \frac{6.900 \times {10}^{10} }{4.000 \times {10}^{8} } \\ 1.725 \times {10}^{10 - 8} \\ 1.725 \times {10}^{2} [/tex]

Hope it will help you :)

Which of the following is not a good safety practice in the kitchen?


A
keep cleaning agents in a safe place away from food supplies

B
keep household cleaners and other hazardous chemicals in their original container

C
mix household cleaners to get a stronger cleaning product

D
keep the phone number for the poison control hotline next to the phone

Answers

Answer:

C

Explanation:

LIFE LESSON: mixing cleaning products can create toxic chemicals and gas. please do NOT attempt doing anything like that kids.

What are the three properties of waves?

Answers

Answer: amplitude, wavelength, and frequency.

Explanation:

How many moles of nitrogen are in a 14.57 gram sample of nitrogen?

Answers

Answer:

[tex]\boxed {\boxed {\sf About \ 1.040 \ moles \ of \ nitrogen }}[/tex]

Explanation:

To convert from grams to moles, we must use the molar mass. This can be found on the Periodic Table. We have a sample of nitrogen, so look for N on the table.

Nitrogen (N): 14.007 g/mol

Now, use this molar mass as a ratio.

[tex]\frac {14.007 \ g \ N }{1 \ mol \ N }[/tex]

Multiply by the number of grams in the sample (14.57)

[tex]14.57 \ g \ N *\frac {14.007 \ g \ N }{1 \ mol \ N }[/tex]

Flip the fraction so the grams of nitrogen will cancel.

[tex]14.57 \ g \ N *\frac {1 \ mol \ N }{14.007 \ g \ N}[/tex]

[tex]14.57 *\frac {1 \ mol \ N }{14.007 }[/tex]

[tex]\frac {14.57 \ mol \ N }{14.007 }[/tex]

[tex]1.04019419 \ mol \ N \\[/tex]

The original measurement of grams had 4 significant figures, so we need to round our answer to the same number of sig figs.

For the number we calculated, that is the thousandth place. The 1 in the ten thousandth place tells us to keep the 0 in the thousandth place.

[tex]1.040 \ mol \ N[/tex]

There are about 1.040 moles of nitrogen in 14.57 grams.

Calcium
and what
makes bones hard

Answers

Bones are made up of a framework of a protein called collagen , with a mineral called calcium phosphate that makes the framework hard and strong. Bones store calcium and release some into the bloodstream when it's needed by other parts of the body.

Worth 20 points will mark you brainliest!

Answers

The one u clicked is the the right one

can you help me on this i neeed help ​

Answers

Answer:

cell,brain,tissue

Explanation:

How would you do this?

Answers

The empirical formula : C₁₀H₂₀O

Further explanation

Given

Combustion of menthol

Required

The empirical formula

Solution

Mass of CO₂ produced : 0.449 g

mass C = 12/44 x 0.449 = 0.122

Mass water produced : 0.1840 g

Mass H = 2.1/18 x 0.1840 = 0.02

Mass O in menthol :

=mass sample - (mass C+mass H)

= 0.1595 - (0.122+0.02)

= 0.0175

Mol ratio C : H : O in sample :

= 0.122/12 : 0.02/1 : 0.0175/16

= 0.01 : 0.02 : 0.001

= 10 : 20 : 1

11. Which elements are least likely to react with other elements? A) metals C) nonmetals B) noble gases D) transition elements​

Answers

Answer:

I believe the answer is B. Noble gases.

Explanation:  

their outer shell is already full of electrons which makes then less reactive.


The creation of carbon monoxide is an effect. What is one cause?

A. the regrouping of the atoms in table salt

B.the burning of fossil fuels

C.cleaning swimming pools

D.operating a stove

Answers

Answer:

Your answer is going to be B. the burning of fossil fuels

Explanation:

This is because carbon monoxide is extremely toxic for us humans. An example of this could be pollution. Hope this helps! :)

5. Describe the effects of photons of light on an electron of the hydrogen atom

Answers

Answer:

How do atoms give off light?

Atoms emit light when they are heated or excited at high energy levels. The color of light that is emitted by an atom depends on how much energy the electron releases as it moves down different energy levels. ... It shows the electron moving down energy levels.

Explanation:

When using the process of evaporation to separate a mixture, what is left behind
in the evaporating dish?

Answers

Answer:

When a solution is heated, the solvent evaporates, leaving behind the dissolved solids as residue. When a solution containing dissolved solutes is heated, the solvent will evaporate. Only the solute will remain in the evaporating dish.

hope it helps! please mark me brainliest

thank you! have a good day ahead

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When using the process of evaporation to separate a mixture, solute is left behind in the evaporating dish

What is evaporation?

Evaporation is a sort of vaporization that occurs on a liquid's surface when it transitions from a liquid to a gas.

Evaporation is a separation technique that can be used to separate components of a combination including a decomposed solid in a liquid. The liquid gets evaporated, which means it is converted from a liquid to a gas. This frequently necessitates the use of heat. The solid will be all that remains after the liquid has entirely evaporated.

To more about evaporation.

https://brainly.com/question/11845221

#SPJ2

I don’t know this question please help

Answers

Answer: A. is elliptical

B. IS inrregulur  C. spiral

Explanation: this should be it

please help me, please

Answers

Answer: NaCl and H2O

Explanation: Products are on the right side of the arrow :)

Answer:

B. NaCI

D. H2O

Explanation:

The product is the result, which in this case is sodium chloride and water.

Please mark as Brainliest!!!

1. Al +
LINO2 + _______ + _________

Answers

answer; the last two is me and u :

Calculate the pH after 0.13 mol NaOH are added to 1.00 L of 0.50M HC2H3O2 and 0.80M NaC2H3O2 buffer solution, Ka= 1.3 x 10^-5. I really need help, I'm struggling with this topic.

Answers

Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green

hoped I helped

Which of the following happens to a molecule of an object when the object is cooled?

Answers

Answer: It loses kinetic energy.

What kind of energy can be transferred?

Help quick please.

Answers

Answer:

Any kind, as long as there is an action.

Answer:

Energy can be transferred from one form to another like kinetic energy to potential energy, light energy to heat energy, kinetic energy to electrical energy, light energy to chemical energy .etc ...

Explanation:

brainest please

How many grams are in 2.0 moles of iron(III) carbonate?

Answers

Explanation:

1 mole is equal to 1 moles Iron(III) or 832.29538 grams, so 2 moles Iron(III) = 1664.59076 grams

1.05 Lab pls help(Measuring Physical Properties Lab Report)

Answers

Answer:

1.05 hopefully this helps

Does anybody know what the dependent and independent variables are?

How does the electron arrangement change moving vertically down a group?​

Answers

Answer:

Electrons arrangement change is almost constant down the group, hence nuclear charge is almost constant.

But the energy levels on which electrons are arranged increase down the group, hence shielding or screening effect increases.

The primary food source for many sea animals is:

crayfish
squid
sea grass
plankton

Answers

Answer:

plankton

Explanation:

like in spongebob lol but for real I'm a marine biologist I know this is the answer lol

27/13AL+? ->> 24/11NA+4/2HE

Answers

Answer:

hhhsstyi chick to yay to today do y'all

Answer:

 ¹₀n

Explanation:

The given expression is:

          ²⁷₁₃Al      +     ₐᵇT   →   ²⁴₁₁Na    +    ⁴₂He

This expression is typical of nuclear reactions. To balance this expression we must conserved the mass number and the atomic number.

The mass number is the superscripts and the atomic number is the subscript;

 Now;

 conserving mass number:

             27 + b  = 24 + 4

             27 + b  = 28  

                   b  = 28 - 27  = 1

conserving the atomic number;

            13 + a  = 11 + 2

             13 + a  = 13

                    a  = 0

So;

The particle T is a neutron    ¹₀n

A student states, "When the alcohol sample was at a temperature of 500 K, all the particles were moving faster than any of the particles were moving at 400 K." Do you agree or disagree with this student’s statement? Justify your answer

Answers

Answer: i rlly dont know srry

Explanation:

What is the mass of 3.01 x 1023 atoms of FeO?

Answers

3.01 x 1023 = 0.50 mol I thinkkkk

Answer these three please! Thank you <3333
(I will give brainliest)

Answers

Answer:

Explanation:

21:B 22:B

xg 4Na + 15g 02 → 70g 2Na20

Answers

Answer: 43.125g

Explanation:4Na+ O2=2Na2O

Molar mass: 23. 32. 62. React.mass: 92.

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Wellness is a state of high level health? Sue makes and sells cupcakes. If she has a cost of $1,500 per year plus a cost of $1 per cupcake, how many cupcakes must she sell in order to make a profit if each cupcake sells for $3? Water in the atmosphere is a gas. When the air cools, water may condense into clouds. Then it may become a liquid or a solid and fall back to the surface of the Earth.Water that falls from clouds is called A. precipitation. B. evaporation. C. groundwater. D. the water cycle. Class A has 20 pupils and class B has 19 pupils.Both classes site the same maths testThe mean score for class A is 33.The mean score for class B is 62What is the mean score (rounded to 2 DP) in the maths test acrossboth classes? Bro I need help pls Ill mark brainliest What is the simplest form of this expression?-x(4x2 - 6x + 1) Approximately how long ago was 1200 BC (or BCE)? feedback, or giving your writing to someone else to look at, is part of:A. prewriting.B. the writing process. C. 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