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  4. The number of s-electrons present in an ion with 55 protons in its unipositive state is

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

JEE MainJEE Main 2023Classification of Elements and Periodicity in Properties

Solution:

$Z =55[ Cs ] \Rightarrow[ Xe ] 6 s ^1$
$\left[ Cs ^{+}\right] \Rightarrow[ Xe ]$ i.e. upto $5 s$ count $e ^{-}$of s-subshell
i.e. $1 s , 2 s , 3 s , 4 s , 5 s \Rightarrow 10$ electrons