Question 1

According to the bonding preferences chart, how many bonds and lone pairs are typically found around a nitrogen atom in a stable molecule?

Accepted Answer

$$3, 1$$

Question 2

Which of the following best describes the bonding and lone pair arrangement for a fluorine atom in a molecule?

Accepted Answer

$$1$$ bond, $$3$$ lone pairs

Question 3

A molecule contains a central oxygen atom. Using the bonding preferences, predict the most likely number of bonds and lone pairs around the oxygen atom.

Accepted Answer

$$2$$ bonds, $$2$$ lone pairs

Question 4

If a carbon atom in a molecule has only three bonds, what is the most likely number of lone pairs on that atom?

Accepted Answer

$$1$$

Question 5

Which rule is used to determine the number of bonds for an atom based on its group number?

Accepted Answer

Group number minus 1

Question 6

A molecule of ammonia ($$\mathrm{NH_3$}) $$contains nitrogen as the central atom. According to bonding preferences, how many lone pairs are on the nitrogen atom?

Accepted Answer

$$1$$

Question 7

Which element from Group 4A is most likely to form four bonds and no lone pairs in a stable molecule?

Accepted Answer

Carbon

Question 8

How many nonbonding electrons are present on a chlorine atom in a stable molecule?

Accepted Answer

$$6 (as $$three lone pairs)

Question 9

Which of the following atoms is most likely to have only one bond and three lone pairs in a stable molecule?

Accepted Answer

Fluorine

Question 10

A student claims that a boron atom in a molecule will have three bonds and one lone pair. Is this correct according to the bonding preferences chart?

Accepted Answer

No, boron typically has three bonds and no lone pairs

Question 11

Which of the following best explains why oxygen in water ($$\mathrm{H_2O}) $$has two lone pairs?

Accepted Answer

Oxygen is in Group 6A and prefers two bonds and two lone pairs for stability

Question 12

Which element is most likely to have no bonds and two lone pairs in a stable molecule?

Accepted Answer

Helium

Question 13

A molecule contains a central atom from Group 5A. How many bonds and lone pairs are expected around this atom?

Accepted Answer

$$3$$ bonds, $$1$$ lone pair

Question 14

Which of the following is a correct application of Rule 2 for determining the number of bonds for a Group 7A element?

Accepted Answer

Number of bonds = $$8 - 7 = 1$$

Question 15

Which atom is most likely to have two bonds and two lone pairs in a stable molecule?

Accepted Answer

Oxygen

Question 16

A student is drawing the Lewis structure for methane ($$\mathrm{CH_4$}). $$According to bonding preferences, how many lone pairs are on the central carbon atom?

Accepted Answer

$$0$$

Question 17

Which of the following elements is most likely to have three bonds and one lone pair in a stable molecule?

Accepted Answer

Nitrogen

Question 18

If an atom from Group 6A forms only one bond in a molecule, how many lone pairs will it have?

Accepted Answer

$$3$$

Question 19

Which of the following statements about nonbonding electrons is correct?

Accepted Answer

Nonbonding electrons are not involved in bonding with other elements

Question 20

A molecule contains a central atom from Group 3A. How many bonds and lone pairs are expected around this atom?

Accepted Answer

$$3$$ bonds, $$0$$ lone pairs

Bonding Preferences and Electron Arrangement in Atoms

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