Question

Write the electronic configuration of the following elements:

(a) $Cr$ ($Z=14$)
(b) $Cu$ ($Z=29$)
(c) $Ca$ ( $Z=20$)

Answer 1

(a) $Cr(z=14)$

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^5$

(b) $Cu(z=29)$

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^1$

(c) $Ca(z=20)$

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