MCQ
Incorrect order of radius is
- A$Sr^{2+} < Rb^+ < Br^- < Se^{2-}$
- B$Nb^{5+} < Zr^{4+} < Y^{3+}$
- C$Co >Co^{2+} > Co^{3+} > Co^{4+}$
- ✓$B{a^{2 + }} < C{s^ + } < S{e^{2 - }} < A{s^{3 - }}$
✓
Answer
Correct option: D.
$B{a^{2 + }} < C{s^ + } < S{e^{2 - }} < A{s^{3 - }}$
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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