Question 1

Which of the following molecules is an example of a free radical that does NOT obey the octet rule?

Accepted Answer

NO

Question 2

How many valence electrons are present in the Lewis structure of the sulfate ion, SO$_3^{2-}$?

Accepted Answer

$26$

Question 3

Which of the following molecules is most likely to have an expanded octet?

Accepted Answer

SF$_6$

Question 4

Which of the following species exhibits resonance in its Lewis structure?

Accepted Answer

SO$_3$

Question 5

A molecule of BeCl$_2$ is an example of:

Accepted Answer

An electron-deficient molecule

Question 6

Which of the following ions has exactly 24 valence electrons in its Lewis structure?

Accepted Answer

NO$_3^-$

Question 7

Which of the following molecules is most likely to NOT have a full octet when forming a covalent compound?

Accepted Answer

BeCl$_2$

Question 8

Which of the following is a correct statement about resonance structures?

Accepted Answer

Resonance structures are different possible Lewis structures for the same molecule.

Question 9

Which of the following molecules contains an odd number of electrons and is therefore a free radical?

Accepted Answer

NO

Question 10

Which of the following molecules can have more than one valid Lewis structure (i.e., exhibits resonance)?

Accepted Answer

SO$_3$

Question 11

Which of the following is an example of a molecule with an expanded octet?

Accepted Answer

XeF$_4$

Question 12

What is the total number of valence electrons in the ClO$_3^-$ ion?

Accepted Answer

$26$

Question 13

Which of the following is NOT an exception to the octet rule?

Accepted Answer

CH$_4$

Question 14

Which of the following molecules is most likely to have resonance structures?

Accepted Answer

NO$_3^-$

Question 15

Which of the following molecules is an example of an electron-deficient molecule?

Accepted Answer

BeCl$_2$

Question 16

Which of the following molecules is most likely to have an expanded octet?

Accepted Answer

IF$_5$

Question 17

Which of the following is a correct description of a free radical?

Accepted Answer

A molecule with an odd number of electrons

Question 18

Which of the following molecules is most likely to violate the octet rule due to having too few electrons?

Accepted Answer

BeCl$_2$

Question 19

Which of the following molecules is most likely to have an expanded octet due to the presence of d orbitals?

Accepted Answer

SF$_6$

Question 20

Which of the following molecules is a free radical and therefore an exception to the octet rule?

Accepted Answer

NO

Covalent Bonding and Electron-Dot Structures: Octet Rule, Resonance, and Exceptions

Study Guide - Practice Questions