For the polyatomic ion XeF5+, why are there 5 Flourine atoms? Thanks.?

Question

Also, in solving enthalpy questions, when using bond dissociation energies, for 2 NH3, why are there no N-N bonds? The book says only 6 N-H bonds. Thanks a million. I am confused by these two.

Answer 1

1. Xe is the only of the noble gasses that has an electronegativity number (or whatever) other than 0, which is why it can react. In general, it is more correct to have octets which is probably what's confusing you. However, some elements pull extra spaces for more electrons from the D orbitals (not sure if you know this, like S orbital, P orbital, D orbital, F, orbital). Since the D orbital has so many spaces, Xe can just tag along more connections

2. When you say 2NH3, that does not mean N2H6, that means 2 separate NH3 molecules. Yes, if it was N2H6, you would have 1 N-N bond, but they are separate molecules so you only have 6 N-H bonds.