The atomic radius of an atom increases down the group due to_.
Correct answer: C. Increase in screening effect
- A. Decrease in distance between nucleus and outermost shell
- B. Increase in nuclear charge
- C. Increase in screening effect
- D. Decrease in number of shells
Explanation
The screening effect is the reduction of nuclear force on the outermost electrons due to inner shells. On moving down the group new shells are added due to which the number of inner shells increases and thus the screening effect also increases. This increase in screening effect causes the atomic radius to increase down the group.
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