Question

In a ground state atom of Br how many electrons total will have the quantum number l=2?

Answer 1

$l=2$

Magnetic quantum number from $(-l \to +l)$ $:(m_1)=-2,-1,0,1,2$ $($ Total $=5)$

For magnetic quantum number,there are two spin quantum number that are $(+\frac{1}{2},-\frac{1}{2})$

So total number of electrons for$\ l=2 \implies 5\times 2=10$