Which one of the following groups represent a collection of isolectronic species ? (At.no `Cs = 55, Br = 35)`

Which one of the following groups represent a collection of isolectronic species ? (At.no `Cs = 55, Br = 35)`
A. `N^(3-),F^(-),Na^(+)`
B. `Be,Al^(3+),Cl^(-)`
C. `Ca^(2+),Cs^(+),Br`
D. `Na^(+),Ca^(2+),Mg^(2+)`

Which one of the following groups represent a collection of isolectronic species ? (At.no `Cs = 55, Br = 35)`

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