1.

The pair, in which ions are isoelectronic with Al3+ is: (A) Br and Be2+(B) Cl- and Li+(C) S2- and K+ (D) O2-and Mg2+

Answer»

Correct option is (D) O2--and Mg2+ 

Isoelectronix species have same no. of electrons Al+3, O2-, Mg+2 all have 10 electrons.



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