The outer electronic configuration of Gd (At. No. 64) is

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ?
n = 3, $$l$$ = 1 and m = $$-$$ 1

The value of Planck's constant is 6.63 $$ \times $$ 10^$$-$$34 J s. The speed of light is 3 $$ \times $$ 10¹⁷ mm s^$$-$$1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 $$ \times $$ 10¹⁵ s^$$-$$1 ?

Based on equation E = $$-$$ 2.178 $$ \times $$ 10^$$-$$18 J $$\left( {{{{Z^2}} \over {{n^2}}}} \right)$$, certain conclusions are written. Which of them is not correct ?