molecular orbitals & bond order

can anyone explain how:
O2 has a bond order of 2
N2 has a bond order of 3
what would the bond orders of N and F (NOT N2 and F2) be?
what would the bond order of NF be?
I realise that they don`t all exist in real life.
Thank`s.

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Never mind then...
Is so hard because u can't draw diagrams..
And what is deleted?

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