more molecular geometry--octet rule and average bond order?

Question

1) I know there are resonance structures for the N2O4 molecule. How do you find the average N-O bond order?

2)which atom is most likely to have less than an octet in its molecules:

- Sulfur?
OR
- Boron?

Answer 1

2) Boron. The typical example you see for Boron is BF3, a stable compoud.

Answer 2

1) You take the average bond length of all the resonance structures.

2) Boron BF3