1.

Which one of the following groupings represents a collection of isoelectronic species     [AIEEE 2003]

A.    \[N{{a}^{+}},\,C{{a}^{2+}},M{{g}^{2+}}\] 
B.    \[{{N}^{3-}},\,{{F}^{-}},\,N{{a}^{+}}\]
C.    \[Be,\,A{{l}^{3+}},\,C{{l}^{-}}\] 
D.    \[C{{a}^{2+}},\,C{{s}^{+}},\,Br\]
Answer» C.    \[Be,\,A{{l}^{3+}},\,C{{l}^{-}}\] 


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