Select from eachgroupthe specieswhichhas thesmallestradius statingappropriate reason (a) O, O^(-) , O^(2-)(b) K^(+), Sr^(2+) , Ar ( C) Si, P,Cl

Select from eachgroupthe specieswhichhas thesmallestradius statingappr

1.	Select from eachgroupthe specieswhichhas thesmallestradius statingappropriate reason (a) O, O^(-) , O^(2-)(b) K^(+), Sr^(2+) , Ar ( C) Si, P,Cl
Answer» Solution :(a) Amongthe differentspeciesof the sameatomthe sizeincreases as themagnitude tonegativecharge increase : Thereforeamong `O, O^(-)` and `O^(2-), O` hasthe smallestradius. (b)Although `Sr^(2+)` has Kr gasconfiguration(i.e., has four shells ) but `K^(+)` has Ar gasconfiguration (i.e., has three shells), nevertheless IONIC sizeof `Sr^(2+)` is smallerthan thatof `K^(+)` obviously due tohigher nuclear charge whichoutweighsthe effect of anadditional shell. ( c) Si P and CI and belongto 3RD period.Sinceatomicsize decrease as thenuclear chargeincrease ThereforeCI withthe HIGHEST nuclear charge hs the smallest radius.