Q: A hospital uses oxygen gas for patient care. If each oxygen atom has the configuration $$1s^2$$ $$2s^2$$ $$2p^4$$, how many electrons are in the $$2s$$ sublevel for a sample containing $$5.0 \times 10$$^{23}$$ oxygen atoms?

$$1.0 \times 10$$^{24}$$ electrons

Question 1

Which of the following statements correctly describes the relationship between principal energy levels (n) and sublevels in an atom?

Accepted Answer

Each principal energy level $$n$$ contains $$n$$ sublevels.

Question 2

How many electrons can be held in the $$3p$$ sublevel?

Accepted Answer

$$6$$

Question 3

Which set of quantum numbers is NOT possible for an electron in an atom?

Accepted Answer

$$n=2$$, $$l=2$$, $$m_l=0$$, $$m_s=+\frac{1}{2}$$

Question 4

A neutral oxygen atom has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^4. $$How many unpaired electrons does it have?

Accepted Answer

$$2$$

Question 5

Which of the following best describes an orbital?

Accepted Answer

A region in space where there is a high probability of finding an electron.

Question 6

How many total electrons can be accommodated in the $$n=3$$ principal energy level?

Accepted Answer

$$18$$

Question 7

Which of the following elements has a completely filled $$2p$$ sublevel in its ground state?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 8

If an atom has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^1$$, what is the element?

Accepted Answer

Sodium ($$\mathrm{Na})$$

Question 9

Which of the following sublevels does NOT exist?

Accepted Answer

$$2d$$

Question 10

A hospital uses oxygen gas for patient care. If each oxygen atom has the configuration $$1s^2$$ $$2s^2$$ $$2p^4$$, how many electrons are in the $$2s$$ sublevel for a sample containing $$5.0 	imes 10$$^{23}$$ oxygen atoms?

Accepted Answer

$$1.0 	imes 10$$^{24}$$ electrons

Question 11

Which of the following correctly lists the sublevels present in the $$n=4$$ principal energy level?

Accepted Answer

$$4s$$, $$4p$$, $$4d$$, $$4f$$

Question 12

A patient is given a medication containing sodium ions. Which of the following is the correct electron configuration for a sodium ion ($$\mathrm{Na}^+$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$

Question 13

Which of the following statements about $$p$$ orbitals is correct?

Accepted Answer

There are three $$p$$ orbitals in each $$p$$ sublevel, and each can hold up to two electrons.

Question 14

Which of the following best explains why the $$2d$$ sublevel does not exist?

Accepted Answer

For $$n=2$$, the only allowed values of $$l$$ are $$0$$ and $$1$$, corresponding to $$s$$ and $$p$$ sublevels.

Question 15

A certain element has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$4s^2$$ $$3d^{10}$$ $$4p^5. $$Which element is this?

Accepted Answer

Bromine ($$\mathrm{Br})$$

Question 16

Which of the following is the maximum number of electrons that can occupy the $$4d$$ sublevel?

Accepted Answer

$$10$$

Question 17

A medical imaging device uses xenon gas. What is the total number of electrons in the $$5p$$ sublevel of a xenon atom?

Accepted Answer

$$6$$

Question 18

Which of the following electron configurations represents an atom in an excited state?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^1$$ $$3p^1$$

Question 19

Which of the following statements about the $$s$$ sublevel is correct?

Accepted Answer

The $$s$$ sublevel contains only one orbital, which can hold up to two electrons.

Atomic Orbitals and Sublevels: Structure and Electron Arrangement

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