Question

A2B5 outer orbital electrons

Answer 1

the No.of electrons in the valence shell electrons in 'A' and 'B' are 5 and 6 respectively, they belong to 15 and 16 th Group of the Long form of the Periodic Table. To simply say they belong to 'Nitrogen' and 'Oxygen' group respectively.
Nitrogen has a variable valency of +3 and +5. But oxygen has predominantly -2.