Question

The number of 2p-electrons having spin quantum number s = -1/2 are:

• A. 6
• B. 0
• C. 2
• D. 3

Answer 1

The correct option is D 3

For 2p-subshell

n = 2

$m_l$ = +1, 0, -1

For each m there are two values of s i.e 1/2 and (-1/2).

Hence, No. of eˉ with s = -1/2 is 3.