The number of s-electrons present in an ion with 55 protons in its unipositive state is [2023]

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Solution

Q.
The number of $s$ -electrons present in an ion with 55 protons in its unipositive state is [2023]

1 8

2 12

3 9

4 10

Ans.
(4)

${Cs}^{+ 1} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} 4 d^{10} 5 s^{2} 5 p^{6}$

$Total number of s -electrons = 10$

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