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12Mg 15P 17Cl 20Ca 160 110 99 197 (pm). So, the order will be: Cl < P < Mg < Ca.

1. Cl < P < Mg < Ca
2. O < S < F < Cl
3. Electron gain enthalpy of given elements are -141, -200, -333 and -349 kJ mol⁻¹ respectively.
4. None of the above.

Correct answer: Cl < P < Mg < Ca

Solution

The given radii values (160, 110, 99, 197 pm) correspond to the atomic radii of Mg, P, Cl, and Ca, respectively. The correct order of increasing atomic radii is Cl < P < Mg < Ca, as atomic size increases down a group and decreases across a period.

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