What element has the electron configuration 1s2 2s2 2p6 3s2 3p2?

Answers

Answer 1

Answer:

The sulfur (S) element of the periodic table is represented by the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^2$ .

The arrangement of electrons within the energy levels or orbitals of an atom is represented by electronic configuration. Sulfur has 16 electrons in its structure. The numbers in the electronic configuration represent the principal energy levels—1, 2, and 3—as well as the orbital—s or p—that the electrons are in.

Detail analysis of electron arrangement:

The first energy level (n = 1) represents the presence of two electrons in the symbol $1s^2$ 1s orbital.
The symbol $2s^2$ indicates the presence of two electrons in the second energy level (n = 2) and the 2s orbital.
The $2p^6$ symbol indicates the presence of 6 electrons in the second energy level (n = 2) and 2p orbitals.
The third energy level, or $3s^2$ , refers to the presence of two electrons in the 3s orbital (n = 3).
$3p^2$ stands for the third energy level (n = 3), and indicates that two of the three p orbitals hold two electrons.

When these electronic configurations are combined, the electron configuration of sulfur (S) is represented by $1s^2 2s^2 2p^6 3s^2 3p^2$ .

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Answer 2

Answer:

Count the number of electrons = 2+2+6+2+2= 14

So, it must be SILICON.

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Given the system at equilibrium:2POCl3(g) + energy <==> 2PCl3(g) + O2(g)
Which changes occur when O2(g) is added tothis system?
(1) The equilibrium shifts to the right and the concentration of PCl3(g) increases.
(2) The equilibrium shifts to the right and the concentration of PCl3(g) decreases.
(3) The equilibrium shifts to the left and the concentration of PCl3(g) increases.
(4) The equilibrium shifts to the left and the concentration of PCl3(g) decreases.

Answers

Given the data from the question, the correct answer to the question is:

The equilibrium shifts to the left and the concentration of PCl₃(g) decreases. (Option 4)

What is chemical equilibrium?

This is simply defined as a state in a chemical system where there is no observable change in the properties of the system with time.

A French scientist postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states as follow:

If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

How to determine the position of equilibrium constant

Considering the question given above, we are concerned with O₂ (i.e concentration) being added to the reaction

2POCl₃(g) + energy <=> 2PCl₃(g) + O₂(g)

According to the principle given above, if more O₂ is added, then, PCl₃ and O₂ will react to produce more POCl₃. Thus, the equilibrium will shift to the left and also PCl₃ will reduce.

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(4) The equilibrium shifts to the left and the concentration of PCl3(g) decreases.

Which of the following statements about ice melting is true?a. Water molecules move into a fixed position.
b. Energy flows from the surroundings to the ice.
c. Water molecules lose energy.
d. The temperature of the ice increases as it melts

Answers

The statement about ice melting that is true is that the temperature of the ice increases as it melts. The answer is letter D. The rest of the choices do not answer the question above.

Which of the following statements are correct about the chemical reaction?H2 + O2 -> H2O2
versus
2 H2 + O2 -> 2 H2O?
They are both balanced chemical equations.
The two reactions are equivalent.
The laws of thermodynamics apply to both.
Conservation of mass applies to both.

Answers

The correct answer for the question that is being presented above is this one: "They are both balanced chemical equations." The statement that is correct about the chemical reaction is that both chemical reaction are balanced chemical equations.

Which is the best tool to find the volume of the base that she needs to neutralize the acid

Answers

The best tool to find the volume of the base taht she needs to neutralize the acid is M1V1 = M2V2. an example is given below.

Given:

12.0 M HCl

2.0 liters of a 3.0 M HCl

Required:

volume of concentrated hydrochloric acid

Solution:

M1V1 = M2V2

(12.0 M HCl)V1 = (3.0 M HCl)( 2.0 liters)

V1 = (3.0 M HCl)( 2.0 liters)/ (12.0 M HCl)

V1 = 0.5 liters

When 20. milliliters of 1.0 M HCL is diluted to a total volume of 60. milliliters, the concentration of the resulting solution is 1. 1.0 M 2. 0.50 M 3. 0.33 M 4. 0.25 M

Answers

The concentration of the resulting solution is 0.33 M. The correct option is 3. 0.33 M

Dilution

From the question, we are to determine the concentration of the resulting solution

From the dilution law,

M₁V₁ = M₂V₂

Where M₁ is the initial concentration

V₁ is the initial volume

M₂ is the final concentration

V₂ is the final volume

From the given information

M₁ = 1.0 M

V₁ = 20 mL

M₂ = ?

V₂ = 60 mL

Then,

1 × 20 = M₂ × 60

20 = M₂ × 60

Therefore,

M₂ = 20 ÷ 60

M₂ = 0.33 M

Hence, the concentration of the resulting solution is 0.33 M. The correct option is 3. 0.33 M

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C₁ * V₁ = C₂ * V₂

1.0 * 20 = C₂ * 60

20 = C₂ * 60

C₂ = 20 / 60

C₂ = 0.33 M

hope this helps!

What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole)?(1) 17.5% (3) 52.5%
(2) 35.0% (4) 60.0%

Answers

Answer:

The correct option is (2) 35.0%

Explanation:

If we want to calculate the percent composition by mass of nitrogen in NH4NO3 we first need to calculate the mass of nitrogen in one mole of NH4NO3.

Because of the molecular form of NH4NO3 (it has 2 ''N'') we know that one mole of NH4NO3 contains 2 moles of N.

The molar mass of N (nitrogen) is $14.0067(g)/(mole)$

This means that 1 mole of N contains 14.0067 grams of N.

Because we have 2 moles of N ⇒ $(2moles).(14.0067(g)/(mole))=28.0134g$

We know that in 1 mole of NH4NO3 we have 2 moles of N(28.0134 g of N).

To calculate the percent composition by mass of nitrogen we need to divide the mass of nitrogen in one mole of NH4NO3 by the mass of one mole of NH4NO3 and then multiply it by 100.

We know that in 1 mole of NH4NO3 there are 80.0 g of NH4NO3 (Because of the molar mass data) ⇒

$((28.0134g)/(80.0g)).100=35.016$ % ≅ 35.0%

We find that the percent composition by mass of nitrogen in NH4NO3 is 35.0%

We conclude that the correct option is (2) 35.0%

gram-formula=80.0grams/mole will be 35.0%

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How many molecules are there in 5.0g of C2H5OH?