A) \[C{{l}^{-}}<{{S}^{2-}}<{{P}^{3-}}\]
B) \[{{P}^{3-}}<{{S}^{2-}}<C{{l}^{-}}\]
C) \[{{S}^{2-}}<C{{l}^{-}}<{{P}^{3-}}\]
D) \[{{P}^{3-}}<C{{l}^{-}}<{{S}^{2-}}\]
Correct Answer: A
Solution :
\[{{P}^{3}},\]\[C{{l}^{-}}\] and \[{{S}^{2-}}\] are isoelectronic ions (\[{{e}^{-}}=18\] in each). In isoelectronic species, the size decreases with increasing nuclear charge (i.e., atomic number). Hence, correct increasing order of size will be: \[C{{l}^{-}}<{{S}^{2-}}<{{P}^{3-}}\]
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