Question

In any sub shell, the maximum number of electrons having same value of spin quantum number is :

• A. $\sqrt{l(l+1)}$
• B. $l+2$
• C. $2l+1$
• D. $4l+2$

Answer 1

The correct option is C $2l+1$

There are $2l+1$ possible states. Each distinct n,l,m orbital can be occupied by two electrons with opposing spins giving $2(2l+1)$ electrons overall. for a given value of n,the values of l are 0 to $n-1$. The maximum no of electrons in nth energy level is $2n^2$