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  4. The value of magnetic quantum number of the outermost electron of Zn +ion is

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Q. The value of magnetic quantum number of the outermost electron of $Zn ^{+}$ion is ______

JEE MainJEE Main 2021Structure of Atom

Solution:

$Zn ^{+} \rightarrow 1 s ^{2} 2 s ^{2} 2 p ^{6} 3 s ^{2} 3 p ^{6} 3 d ^{10} 4 s ^{1}$
Outermost electron is in $4 s$ subshell $m =0$