Answers

2016-03-31T13:55:47+05:30
NF5. Is most stable. So I think . Because of compete octet. 3 +5=8 
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2016-03-31T13:57:13+05:30
NF5.nitrogen is a small molecule so it cannot stabilize 5 flourine (electronegative atom )but for phosphorus it can stabilize 5 fluorine atoms so pf5 is possible and nf5 is not.
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if it helps mark it as brainliest answer.plz