Question 1

Which of the following statements best describes the maximum number of electrons that can be found in a d sublevel?

Accepted Answer

$$10$$

Question 2

An atom has $$16$$ protons and $$18$$ neutrons. What is its mass number?

Accepted Answer

$$34$$

Question 3

Which of the following electron configurations represents a noble gas?

Accepted Answer

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

Question 4

Which element has the electron configuration $$[Ar]\ 4s^2$\ 3d$$^{10}$$\ 4p^5$?

Accepted Answer

Bromine

Question 5

How many valence electrons does an atom of sulfur have?

Accepted Answer

$$6$$

Question 6

Which of the following best describes the charge on an oxide ion ($$O^{2-}$$)?

Accepted Answer

$$-2$$

Question 7

What is the maximum number of electrons that can be found in the third shell?

Accepted Answer

$$18$$

Question 8

Which of the following elements is most likely to form a $$2+$$ ion?

Accepted Answer

Magnesium

Question 9

The $$p$$ sublevel contains how many orbitals?

Accepted Answer

$$3$$

Question 10

Which of the following is the correct electron configuration for an atom with atomic number $$20$$?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$

Question 11

Which of the following best describes the group of elements whose atoms have a stable electron configuration?

Accepted Answer

Noble gases

Question 12

If an atom has $$36$$ protons, how many electrons does it have if it is neutral?

Accepted Answer

$$36$$

Question 13

Which of the following is the correct order for filling electron sublevels according to the Aufbau principle?

Accepted Answer

$$1s \rightarrow 2s \rightarrow 2p \rightarrow 3s \rightarrow 3p \rightarrow 4s \rightarrow 3d$$

Question 14

Which of the following ions has the same electron configuration as neon?

Accepted Answer

$$\mathrm{N$$^{3-}$$}$$

Question 15

What is the name of the group that contains the element with atomic number $$54$$?

Accepted Answer

Noble gases

Question 16

Which of the following best describes the maximum number of electrons that can be found in the $$f$$ sublevel?

Accepted Answer

$$14$$

Question 17

Which of the following is the correct electron configuration for $$\mathrm{Al$$^{3+}$$}$$?

Accepted Answer

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

Question 18

Which of the following best describes the valence shell of an atom?

Accepted Answer

The outermost shell containing electrons

Question 19

Which of the following elements is a metal and is found in Group 2 of the periodic table?

Accepted Answer

Magnesium

Question 20

Which of the following best describes the meaning of the term 'isoelectronic'?

Accepted Answer

Having the same number of electrons

Atomic Structure: Study Guide and Practice Questions

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