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

COMEDKCOMEDK 2010Structure of Atom

Solution:

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