Q: Which of the following is the correct formula to determine the number of bonds for elements in Group 5A?

$$\text{Number of bonds} = \text{Group number} - 2$$

Question 1

According to the Common Bonding Preferences table, how many bonds and lone pairs are typically found around a nitrogen atom in a stable molecule?

Accepted Answer

3 bonds, 1 lone pair

Question 2

Which of the following best describes a lone pair in a molecule?

Accepted Answer

A pair of nonbonding electrons localized on a single atom

Question 3

Using Rule 1 (Group 1A - 4A: number of bonds = group number), how many bonds would you expect a carbon atom to form in a stable organic molecule?

Accepted Answer

4

Question 4

Sulfur is in Group 6A. According to the bonding preferences, how many lone pairs and bonds does a sulfur atom typically have in a stable compound?

Accepted Answer

2 bonds, 2 lone pairs

Question 5

Which element from the table is most likely to form only one bond and have three lone pairs in a stable molecule?

Accepted Answer

Fluorine

Question 6

A student draws a Lewis structure for water ($$\mathrm{H_2O}) $$and shows oxygen with two bonds and two lone pairs. Is this correct according to the bonding preferences?

Accepted Answer

Yes, oxygen typically has two bonds and two lone pairs

Question 7

Which of the following elements is most likely to have no lone pairs and only one bond in a stable molecule?

Accepted Answer

Hydrogen

Question 8

If a magnesium atom (Group 2A) forms a compound, how many bonds and lone pairs would you expect it to have?

Accepted Answer

2 bonds, 0 lone pairs

Question 9

Which statement best explains why oxygen typically forms two bonds in a molecule?

Accepted Answer

Oxygen is in Group 6A, and the number of bonds is group number minus 2

Question 10

A molecule contains a central atom from Group 5A. According to the bonding preferences, what is the expected number of bonds and lone pairs for this atom?

Accepted Answer

3 bonds, 1 lone pair

Question 11

Which of the following best describes the difference between bonding and nonbonding electrons?

Accepted Answer

Bonding electrons are shared between atoms, while nonbonding electrons remain on a single atom

Question 12

In a molecule of ammonia ($$\mathrm{NH_3$}$$), how many bonds and lone pairs are present around the nitrogen atom?

Accepted Answer

3 bonds, 1 lone pair

Question 13

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

Accepted Answer

Oxygen

Question 14

A student claims that beryllium (Group 2A) should have two lone pairs and no bonds in a compound. Is this correct?

Accepted Answer

No, beryllium typically forms two bonds and has no lone pairs

Question 15

Which of the following is the correct formula to determine the number of bonds for elements in Group 5A?

Accepted Answer

$$	ext{Number of bonds} = 	ext{Group number} - 2$$

Question 16

In a molecule of methane ($$\mathrm{CH_4$}$$), how many bonds and lone pairs are present around the carbon atom?

Accepted Answer

4 bonds, 0 lone pairs

Question 17

Which element is most likely to have only one bond and no lone pairs in a stable molecule?

Accepted Answer

Hydrogen

Question 18

A molecule contains a central atom from Group 7A. According to the bonding preferences, what is the expected number of bonds and lone pairs for this atom?

Accepted Answer

1 bond, 3 lone pairs

Question 19

Which of the following best explains why fluorine rarely forms more than one bond in compounds?

Accepted Answer

Fluorine is highly electronegative and prefers to keep three lone pairs

Question 20

Which of the following elements is most likely to have no lone pairs and two bonds in a stable molecule?

Accepted Answer

Beryllium

Bonding Preferences and Electron Arrangement in Main Group Elements

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