ChemistryWiki | RecentChanges | Preferences
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) C is the central atom with 0 LP. 2 single bond and 1 double bond,
There are 3 structures with <--> in between the structures.
4) Se is central atom with 0 LP. 6 single bonds.