Question

Maximum value of ( n +l+m) for unpaired electrons in second excited state of chlorine ₁₇Cl is

• A. 28
• B. 25
• C. 20
• D. 18

Answer 1

Answer: (B)

25

The maximum value of (n+l+m) for all the unpaired electrons of chlorine in its second excited state.

Electronic configuration of chlorine atom

$1s^{2}2s^{2}2p^{6}3s^{2}3p^5$

First exited state chlorine atom

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}3d^1$

Second, exited state chlorine atom

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}3d^2$

The value of n, l, m for each unpaired electron will be,