Questions: An ion contains 1 nitrogen atom and 2 hydrogen atoms. It has an H-N-H bond angle of approximately 105°. Which row is correct? number of lone pairs around N in ion overall charge on ion ---------------------------------------------------------------- A 1 +1 B 2 +1 C 1 -1 D 2 -1

Solution Steps

Nitrogen typically has 5 valence electrons. In the ion described, nitrogen is bonded to two hydrogen atoms. Each hydrogen atom forms a single bond with nitrogen, using 2 of nitrogen's valence electrons. This leaves 3 valence electrons on nitrogen, which form one lone pair.

The ion contains 1 nitrogen atom and 2 hydrogen atoms. Normally, a neutral NH\(_2\) molecule would have 5 (from N) + 1 (from each H) = 7 electrons. However, the ion has an overall charge, which means it has either gained or lost electrons.

Given the bond angle of approximately \(105^\circ\), which is close to the bond angle in water (H\(_2\)O), it suggests a similar electron pair geometry, indicating the presence of lone pairs.

To determine the charge, we need to consider the typical bonding and lone pairs:

• If nitrogen has 2 lone pairs, it would have 4 electrons in lone pairs and 2 in bonds, totaling 6 electrons. This would mean it has gained 1 electron, resulting in a -1 charge.

Final Answer