The species Cl- , K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?
K+ < Cl- < Ca2+
Cl- < K+< Ca2+
Ca2+< K+ < Cl-
Ca2+ < Cl- < K+
For isoelectronic ions, anion with greater negative charge will have larger radius and cation with more positive charge will have small radius. So, order is Ca2+ < Cl- < K+
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