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Q. Which have the same number of s-electrons as the d-electrons in $Fe^{2+}$?

Structure of Atom

Solution:

$P \left(1 s ^{2}, 2 s ^{2} 2 p ^{6}, 3 s ^{2} 3 p ^{3}\right)$ has 6 electrons in s-subshells as in d-shell of $Fe ^{2+}$