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Isoelectronic Species

Which of the ...

Question

Which of the following species has the smallest radius?

A

K

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B

Ca

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C

Ca²⁺

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D

K⁺

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Solution

The correct option is C
Ca²⁺

Calcium is smaller than potassium since it comes to its right in the same period. Since cations are smaller than their parent atoms because of increase in nuclear charge, $C a^{+ 2}$ is the smallest among the given options.

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