The species Ar,K^{+} and Ca^{2+} contain the | vedclass

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(A) The species $Ar$,$K^{+}$,and $Ca^{2+}$ are isoelectronic,meaning they all contain $18$ electrons.For isoelectronic species,the ionic radius decrea

Vedclass · Accepted Answer

$Ca^{2+} < K^{+} < Ar$

Vedclass · Answer

(A) The species $Ar$,$K^{+}$,and $Ca^{2+}$ are isoelectronic,meaning they all contain $18$ electrons.For isoelectronic species,the ionic radius decreases as the nuclear charge $(Z)$ increases.The atomic numbers are: $Ar$ $(Z=18)$,$K^{+}$ $(Z=19)$,and $Ca^{2+}$ $(Z=20)$.Since the nuclear charge increases in the order $Ar Therefore,the order of increasing radii is $Ca^{2+} < K^{+} < Ar$.

The species $Ar$,$K^{+}$ and $Ca^{2+}$ contain the same number of electrons. In which order do their radii increase?

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