Question 1

Which of the following elements is most likely to form an expanded octet in its Lewis Dot Structure?

Accepted Answer

Sulfur (S)

Question 2

How many valence electrons are present in the Lewis Dot Structure for xenon dibromide, XeBr$$_2$$?

Accepted Answer

$$16$$

Question 3

Which of the following is a correct statement about free radicals?

Accepted Answer

They contain a single unpaired electron.

Question 4

What is the total number of valence electrons in the Lewis Dot Structure for the radical of nitrogen dioxide, NO$$_2$$?

Accepted Answer

$$17$$

Question 5

Which group on the periodic table is most likely to have an incomplete octet in its Lewis Dot Structure?

Accepted Answer

Group 2A

Question 6

When drawing the Lewis Dot Structure for SOCl$$_2$$, what is the total number of valence electrons to account for?

Accepted Answer

$$26$$

Question 7

Which of the following ions requires the use of an expanded octet in its Lewis Dot Structure?

Accepted Answer

SiF$$_6$$^{2-}$$

Question 8

What is the correct number of valence electrons for the Lewis Dot Structure of POCl$$_3$$?

Accepted Answer

$$32$$

Question 9

Which of the following statements about Lewis Dot Structures is FALSE?

Accepted Answer

Radicals always have paired electrons.

Question 10

In the Lewis Dot Structure for the hydroxide radical, OH, how many total valence electrons are present?

Accepted Answer

$$7$$

Question 11

Which of the following best explains why SiF$$_6$$^{2-}$$ can have more than 8 electrons around silicon?

Accepted Answer

Silicon is a metalloid and can use d orbitals for bonding.

Question 12

What is the group number for elements that commonly form expanded octets?

Accepted Answer

$$14$$

Question 13

Which of the following molecules is most likely to have a single unpaired electron in its Lewis Dot Structure?

Accepted Answer

NO$$_2$$

Question 14

When drawing the Lewis Dot Structure for POCl$$_2$$, which atom is most likely to be the central atom?

Accepted Answer

Phosphorus (P)

Question 15

Which of the following is NOT a valid exception to the octet rule?

Accepted Answer

Complete octets in Group 1A elements

Question 16

How many electrons are needed to complete the octet for a nitrogen atom in a Lewis Dot Structure?

Accepted Answer

$$8$$

Question 17

Which of the following best describes the bonding in SOCl$$_2$$?

Accepted Answer

Sulfur is the central atom bonded to one oxygen and two chlorine atoms.

Question 18

What is the total number of valence electrons in the Lewis Dot Structure for SiF$$_6$$^{2-}$$?

Accepted Answer

$$48$$

Question 19

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

BeCl$$_2$$

Question 20

Which of the following is a correct step when drawing a Lewis Dot Structure for a molecule with an expanded octet?

Accepted Answer

Assign extra electrons to the central atom after all outer atoms have complete octets.

Lewis Dot Structures: Octet Rule, Exceptions, and Odd Electron Molecules

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