Which of the followingsetscontainonly isoelectronicions ?

1.	Which of the followingsetscontainonly isoelectronicions ?
Answer» `Zn^(2+) , CA^(2+) , Ga^(3+) ,A1^(3+)` `K^(+),Ca^(2+)Sc^(3+) ,C1^(-)` `P^(3-) , S^(2-), C1^(-) , K^(+)` `Ti^(4+), Ar, Cr^(3+) ,V^(5+)` Solution : Species ofset (a)i.e.,`Zn^(2+)(30-2 = 28 ) , Ca^(2+)(20 -2=18), Ga^(3+) (31-3 = 28) , A1^(3+)(13 -3=10)` havedifferentno of electron and henceare notisoelectronicions. Species ofset ( b) i.e.,`K^(+)(19-1=18) ,Ca^(2+)(20-2 =18) , Sc^(3+)(21-3=18) ,C1^(-)(17+1=18) `are allisoelectron ionssince each one of themhas 18electrons. Speciesof set (c )i.e., `P^(3-)(15+3 =18),S^(2-)(16+2 =18),C1^(-)(17+ 1=18) , K^(+)(19-1=18) ` are allisoelectron ionssince EACHONE of themhas 18 electrons . Species ofset (d) i.e., `Ti^(4+) (22 -4 =18),Ar (18), Cr^(3+)(24-3=21) ,V^(5+)(23 -5= 18)` have DIFFERENT numberof electron and henceare notisoelectronicions.

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