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Identify the correct order of the size of the following:

1. Ca2+ < K+ < Ar < Cl− < S2−
2. Ar < Ca2+ < K+ < Cl− < S2−
3. Ca2+ < Ar < K+ < Cl− < S2−
4. Ca2+ < K+ < Ar < S2− < Cl−

Correct answer: Ca2+ < Ar < K+ < Cl− < S2−

Solution

The ionic size increases as the effective nuclear charge decreases for the same number of electrons. The correct order is Ca2+ < Ar < K+ < Cl− < S2−.

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