The electronic configuration of copper Cu 29 is - Infinity Learn by Sri Chaitanya

A
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} 4 s^{2}$
B
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
C
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 4 p^{6}$
D
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$

Solution:

$3 d$ subshell filled with $10$ electrons (fully-filled) is more stable than that filled with $9$ electrons. $1, 4 s$ electrons jumps into $3 d .$ subshe!I for more stability.

The electronic configuration of copper $({}_{29}{Cu})$ is

Solution:

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