Question 1

Which of the following elements is most likely to have an incomplete octet in its Lewis dot structure?

Accepted Answer

Boron (B)

Question 2

What is the total number of valence electrons in the Lewis dot structure for the sulfate ion, $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$32$$

Question 3

Which of the following molecules is an example of a free radical?

Accepted Answer

$$\mathrm{NO_2$}$$

Question 4

How many electrons are present around the central atom in the Lewis dot structure of $$\mathrm{SF_6$}$$?

Accepted Answer

$$12$$

Question 5

Which group of elements can have expanded octets in their Lewis dot structures?

Accepted Answer

Group 5A and higher (period 3 and below)

Question 6

A molecule of $$\mathrm{$$SOCl_2$$} is $$drawn. What is the total number of lone pairs on the central atom (S) in its Lewis dot structure?

Accepted Answer

$$0$$

Question 7

Which of the following best explains why $$\mathrm{NO_2$} is a $$free radical?

Accepted Answer

It has an odd number of valence electrons.

Question 8

Which of the following ions requires the use of an expanded octet in its Lewis dot structure?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 9

How many total electrons are present in the Lewis dot structure for the hydroxide radical, $$\mathrm{OH}$$?

Accepted Answer

$$8$$

Question 10

Which of the following statements about Lewis dot structures is correct?

Accepted Answer

Atoms achieve stability by sharing, gaining, or losing electrons to complete their valence shell.

Question 11

Which of the following molecules is most likely to violate the octet rule by having fewer than 8 electrons around the central atom?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 12

A chemist is analyzing the Lewis dot structure of $$\mathrm{$$POCl_3$$}. $$What is the formal charge on the phosphorus atom if all single bonds are present?

Accepted Answer

$$0$$

Question 13

Which of the following best describes the bonding in a molecule with an odd number of valence electrons?

Accepted Answer

It is a free radical and will have an unpaired electron.

Question 14

Which of the following is a correct Lewis dot structure for the radical $$\mathrm{NO_2$}$$?

Accepted Answer

A structure with one unpaired electron on the nitrogen atom.

Question 15

Which of the following best explains why $$\mathrm{SF_6$}$$ can have more than 8 electrons around the central atom?

Accepted Answer

Sulfur is in period 3 and has access to d orbitals.

Lewis Dot Structures: Exceptions and Odd Electron Molecules

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