If n and `l` are respectively the principal and azimuthal quantum numbers , then the expression for calculating the total number of electrons in any energy level is :

Options

A. `underset(l=1)overset(l=n)(sum)2(2l+1)`
B. `underset(l=1)overset(l=n-1)(sum)2(2l+1)`
C. `underset(l=0)overset(l=n+1)(sum)2(2l+1)`
D. `underset(l=0)overset(l=n-1)(sum)2(2l+1)`

Answer

D

Explanation

`lambda=v " "lambda=(h)/(mv)`
`lambda^(2)=(h)/(m)implies lambda=((h)/(m))`