Which of the following pair(s) represent(s) the isoelectronic species ?
A. `S^(2-)` & `Sc^(3+)`
B. `SO_(2)` & `NO_3^(-)`
C. `N_(2)` & `CN^(-)`
D. `NH_3` & `H_3O^+`

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Correct Answer - A,B,C,D
Species having same number of electrons are called isoelectronic specis.

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