1.

Which of the following has the largest atomic radius?A. `Mg`B. `Ca`C. `Sr`D. `Ba`

Answer» Correct Answer - D
On descending a group in the periodic table, the sizes of the atoms increase due to the effect of extra shells of electrons outweights the effect of increased nuclear charge on account of increasing shielding effect of inner eletrons. The order is `Mg lt Ca lt Sr lt Ba`.


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