Which of the following sets contain only isoelectronic ions ?

1.	Which of the following sets contain only isoelectronic ions ?
Answer» `Zn ^(2+), Ca ^(2+), Ca ^(2+), Al ^(3+)` `K ^(+), Ca ^(2+), Sc ^(3+), Cl ^(-)` `P ^(3-), S ^(2-), Cl ^(-), K^(+)` `Ti^(4+), Ar, CR ^(3+), V ^(5+)` Solution :`(a) Zn ^(2+) (30-2=28), Ca ^(2+) (20-2=18), Ca ^(3+)` `(31-3 =28) , Al ^(3+) , Al ^(3+) (13 -3=10)` are not isoelectronic, (b) `K ^(+) (19-1=18), Ca ^(2+) (20-2=18), Se ^(3+) (21 -3=18),` `Cl^(-) (17 + 1=18) ` are isoelectronic. (c )` P ^(3-) (15 +3 =18), S ^(2-) (16 +2 =18), Cl^(-)(17 + 1=18),` `K ^(+)(19-1 =18) ` are isoelectronic. (d) `Ti ^(4+) (22 -4=18), Ar (18), Cr ^(2+) (24-3=21),` `V ^(5+) (23-5=18)` are not isoelectronic.

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