Which of the following ion has the largest radius?
A
Cl−
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B
S2−
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C
Na+
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D
F−
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Solution
The correct option is AS2− Atomic radius increase down a group as the number of electrons increases.
For isoelectronic species, anions are larger than the neutral atom which in turn is larger than the cations.
Consider all the options:- A) Cl−→ Anion with 18e−.
B) S2−→ Anion with 18e−.
C) Na+→ Cation with 10e−.
D) F−→ Anion with 10e−.
As reasoned above, species with 18e− are larger than species with 10e−. Hence, the largest species is either Cl− or S2−. Since in the case of S2− there will be greater electron-electron repulsion, S2− will be larger than Cl−.