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Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is:

1. Ca < Mg < P < Cl
2. Mg < Ca < Cl < P
3. Cl < P < Mg < Ca
4. P < Cl < Ca < Mg

Correct answer: Cl < P < Mg < Ca

Solution

Atomic radius increases down a group and decreases across a period. Cl and P are in the same period, with Cl being smaller. Mg and Ca are in the same group, with Ca being larger. Thus, the correct order is Cl < P < Mg < Ca.

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