Question

The outer electronic configuration $s^2p^5$ is possessed by

• A. Ar
• B. Cu
• C. Cl
• D. Na

Answer 1

Answer: (C)

Cl

Answer 2

$_{18}Ar : 1s^2, 2s^2, 2p^6, 3s^2, 3p^6$
$_{29}Cu : 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^1$
$_{17}Cl : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$
$_{11}Na : 1s^2, 2s^2, 2p^6, 3s^1$