Groupings represents a collection of isoelectronic species, Chemistry

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Which one of the following groupings represents a collection of isoelectronic species:

(1) NA+, Ca2+, Mg2+      

(2)  N3, F-, Na+

(3)  be, Al3+, Cl-                              

(4) Ca2+, Cs+,Br

Ans:  N3, F-, Na+


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