Total orbital angular momentum of electron in s-orbital is equal to zero.

An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers

The electronic configuration of N atom is

The value of m for dz² is zero.

B < Al < In < Ga < Tl

B < Al < Ga < In < Tl

B < Ga < Al < Tl < In

B < Ga < Al < In < Tl

MgO

BeO

BaO

CaO

NO

CN^–

CN⁺

NO