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