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

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Classification of Elements and Periodicity in Properties

2015

chemistry

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

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

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

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

Explanation

To solve this problem, we need to compare the ionic radii of Ar, K $^+,$ and Ca $^{2+}. \\ \\$ All three species have the same number of electrons, specifically 18 electrons, $\\$ since they are isoelectronic. The electronic configuration for each is:

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The species Ar, K+^+ + and Ca2+^{2+} 2+ contain the same number of electrons. In which order do their radii increase?

Explanation

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