Bond lengths

[giuliapetruzzi_2A]

On the Achieve Week 5, 6, question 11:

We're asked to rank N-I, N-H, and N-O bonds from longest to shortest.

I know that it's related to atomic radius. I also initially assumed that greater nuclear charge creates a shorter bond due to electrons being more drawn in. Is that true?

[Avyay_Toprani_2H]

atomic radius and nuclear charge go hand in hand, so that is the correct wat to go about the question?

[306401429]

Yes, that is true. The correct order from longest to shortest bond length would be N-I, N-H, N-O. The greater the atomic radius, the longer the bond length. This also means that as an atom gets bigger, its nuclear charge becomes weaker. High nuclear charge indicates that the electrons are being pulled in tightly to the nucleus, causing a smaller atomic radius. This is why atomic radius and nuclear charge go hand in hand.