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1) N is central atom with 0 Lone pairs (LP). 1 double bond and 2 single bond.
There are 3 structures with <--> in between each structure.
2) As is central atom with 0 LP. 5 single bond.
3) O is the central atom with 1 LP. 1 single bond and 1 double bond,
There are 2 structures with <--> in between each structure.
4) Se is central atom with 0 LP. 6 single bonds.