Which of the following groupings represents a collection of isoelectronic species? { Atomic nos. ----> Cs = 55, Br = 35 } a) Ca²+, Cs+, Br b) Na+, Ca²+ , Mg²+ c) N³-, F-, Na+ d) Be, Al³+, Cl
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b)( Na+, Ca²+ , Mg²+ c) N³-, F-, Na+ this is your answer
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