<p>Rank the following species in order of increasing H-N-H bond angles:</p>
<p>I. NH2-
II. NH3
III. NH4+</p>
<p>A. I<II<III
B. I<III<II
C. II<III<I
D. III<II<I
E. III<I<II</p>
<p>Why is the answer A and not B? I thought I should have the largest bond angle since it starts out with 180 degrees goes down because of the 2 lone pairs. And I thought III starts out with 109.5 degrees and goes down because of 1 lone pair, so I thought it has the lowest bond angle.</p>