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Question

The correct decreasing order of atomic size among the following species is:

Ar, K+, Cl−, S2−, Ca2+

A
Ca2+>K+>Ar>Cl>S2
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B
K+>Ca2+>Cl>Ar>S2
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C
S2>Cl>Ar>K+>Ca2+
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D
S2>Ar>Cl>Ca2+>K+
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Solution

The correct option is B S2>Cl>Ar>K+>Ca2+
In isoelectronic ions, the atomic size decreases as ze ratio increases.
S2 [ze]=1618; Cl [ze]=1718; Ar [ze]=1818; K+ [ze]=1918; Ca2+ [ze]=2018

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