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WAEC Chemistry 2017 Paper

Question : 4

Total: 50

The species with no electron in the 3d-orbital is

$Zn^{2+}$
$Sc^{3+}$
Cu
$Mn$

Solution:

Scandium has electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{1}4s^{2}$ hence, $Sc^{3+}$ has configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ . Hence, no electron in the 3d-orbital.

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