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Question

The correct decreasing order of atomic size of the following species is:
K+,Cl−,S2−,Ca2+

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

The correct option is C S2>Cl>K+>Ca2+
The given atoms and ions are isoelectronic.
In isoelectronic ions, the atomic size decreases as ze ratio increases.
For S2, ze=1618
Cl, ze=1718
K+, ze=1918
Ca2+, ze=2018
So the correct decreasing order of atomic size is
S2>Cl>K+>Ca2+

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