First slide

Periodicity in atomic properties

Question

Which of the following represents an excited state of an atom?

Moderate

A

$[Ne] 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{8}$
B

$[Ne] 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{5}$
C

$[Ne] 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1}$
D

$1 s^{2} 2 s^{2} 2 p^{5} 3 s^{1}$

Solution

$_{10} Ne ⟶ 1 s^{2} 2 s^{2} 2 p^{6}$
$Excited state of Ne is 1 s^{2} 2 s^{2} 2 p^{5} 3 s^{1} .$

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