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

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

A.

$Zn^{2+}$

B.

$Sc^{3+}$

C.

Cu

D.

$Mn$

View answer & explanation

Correct answer is B

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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