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Which of the following groupings represents a collection of isoelectronic species ? (Z for Cs = 55, Br = 35)

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Which of the following groupings represents a collection of isoelectronic species ? (Z for Cs = 55, Br = 35)

(a) Na+, Ca2+ and Mg2+

(b) N3-, F- and Na+

(c) Be, Al3+ and Cl-

(d) Ca2+, Cs+ and Br

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Correct option is (b) N3-, F- and Na+

Only in option (b) all species have same number of electrons (8).

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