The following quantum numbers are possible for how many orbitals :

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

Isoelectronic species are

For given energy, E = 3.03 $$ \times $$ 10^$$-$$19 Joules corresponding wavelength is (h = 6.626 $$ \times $$ 10^$$-$$34 J sec, c = 3 $$ \times $$ 10⁸ m/sec)