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Which of the following has the lowest second ionization energy?

a. Ca b. Ne c. K d. Ar e. Na

Arrange the following set of ions in order of increasing atomic radii.

Ca2+, Cl-, K+, P3-, S2-

a. Ca2+ < K+ < P3- < S2- < Cl-
b. K+ < Cl- < Ca2+ < S2- < P3-
c. P3- < S2- < Cl- < K+ < Ca2+
d. Ca2+ < K+ < Cl- < S2- < P3-
e. Cl- < S2- < P3- < Ca2+ < K+

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