Which of the following elements has the least distance from nucleus to the outermost shell?

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Solution

The correct option is D
Ar

All of the stated elements belong to the third period of the modern periodic table. Atomic radius decreases from left to right in a period. Due to increase in the number of protons, the nucleus pulls the valence shell more effectively. Argon (Ar) is the rightmost element and hence has the least distance from the nucleus to the outermost shell.

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