Question 1

Which statement best describes the relationship between principal energy levels and the periods of the periodic table?

Accepted Answer

The principal energy level number $$n$$ generally corresponds to the period (row) of the periodic table.

Question 2

When an electron in an atom absorbs energy, what is the most likely immediate result?

Accepted Answer

The electron jumps to a higher energy level.

Question 3

Which of the following best explains why each element has a unique atomic spectrum?

Accepted Answer

Each element has a unique set of energy levels, resulting in a unique pattern of spectral lines.

Question 4

How many sublevels are present in the third principal energy level ($$n=3) of an $$atom?

Accepted Answer

Three sublevels: s, p, and d

Question 5

Which sublevel has the lowest energy in any principal energy level?

Accepted Answer

s sublevel

Question 6

What is the maximum number of electrons that can occupy a single orbital?

Accepted Answer

Two

Question 7

Which of the following statements about s orbitals is correct?

Accepted Answer

An s orbital has a spherical shape and increases in size as $$n$$ increases.

Question 8

How many orbitals are present in a p sublevel?

Accepted Answer

Three

Question 9

Which electron configuration correctly represents oxygen?

Accepted Answer

$$1s^22s^22$p^4$$

Question 10

A student observes colored lines when viewing the light emitted from a heated element through a prism. What is the best explanation for this observation?

Accepted Answer

Electrons are falling to lower energy levels, emitting energy as light at specific wavelengths.

Question 11

Which of the following is the correct electron configuration for chlorine (Cl)?

Accepted Answer

$$1s^22s^22$p^63s^23$p^5$$

Question 12

Which of the following best describes the order in which sublevels fill with electrons?

Accepted Answer

Electrons fill sublevels in the order: s, p, d, f, starting with the lowest energy.

Question 13

How many electrons can be held in all the orbitals of the second principal energy level ($$n=2$$)?

Accepted Answer

8

Question 14

Which of the following is true about the spins of electrons in the same orbital?

Accepted Answer

They must have opposite spins.

Question 15

A magnesium atom has 12 electrons. What is its correct electron configuration?

Accepted Answer

$$1s^22s^22$p^63s^2$

Question 16

Which of the following statements about orbitals is correct?

Accepted Answer

An orbital is a three-dimensional space where an electron is most likely to be found.

Question 17

Which element has the electron configuration $$1s^22s^22$p^63s^23$p^64s^2$?

Accepted Answer

Calcium (Ca)

Question 18

If an atom has a completely filled p sublevel in its second energy level, how many electrons are present in that p sublevel?

Accepted Answer

6

Question 19

Which of the following best describes the difference between an orbital and a sublevel?

Accepted Answer

A sublevel contains orbitals of the same energy, while an orbital is a region where an electron is likely to be found.

Question 20

Which of the following electron configurations is correct for potassium (K)?

Accepted Answer

$$1s^22s^22$p^63s^23$p^64s^1$

Energy Levels, Sublevels, and Electron Configuration in Atoms

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