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Question:

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

P<Cl<Ca<Mg

Ca<Mg<P<Cl

Mg<Ca<Cl<P

Cl<P<Mg<Ca

Solution:

The atomic radii decreases on moving from left to right in a period, thus order of sizes for Cl, P, and Mg is Cl<P<Mg. Down the group size increases. Thus overall order is :Cl<P<Mg<Ca. So, option D is correct.