Question
Incorrect order of radius is
✓
Answer
d
$(d)$ In $(a)$ and $(b)$ use $(z / e)$ concept for isoelectronic specie.
In $(c)$ size of neutral atom is greater than its cation.
In $(d)\, Se^{2-}$ and $As^{3-}$ related with $4^{th}$ period, while $Ba^{2+}$ and $Cs^+$ related with $6^{th}$ period. (These are not isoelectronic species.)
$(d)$ In $(a)$ and $(b)$ use $(z / e)$ concept for isoelectronic specie.
In $(c)$ size of neutral atom is greater than its cation.
In $(d)\, Se^{2-}$ and $As^{3-}$ related with $4^{th}$ period, while $Ba^{2+}$ and $Cs^+$ related with $6^{th}$ period. (These are not isoelectronic species.)
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