Total number of electron in any energy level is

Options

A. `sum_(l = 0)^(l = n-1)2 (2l +1)`
B. `sum_(l=0)^(l=n)2(2l +1)`
C. `sum_(l=0)^(l=n+1)2(2l+1)`
D. `sum_(l=1)^(l=n-1)2 (2l+1)`

Answer

A

Explanation

no. of `e^(-)` in a sublevel `=4l +2`