Main axis of a diatomic molecule is z, molecular orbital p_x and p_y overlap to from which of the following orbitals.

The following quantum numbers are possible for how many orbitals :

n = 3, $$l$$ = 2, m = +2 ?

Which of the following two are isostructural?

Nitrogen forms N₂, but phosphorus does not form P₂, however, it converts P₄, reason is