Question

Atomic radius goes on decreasing while going from left to right in a period

Answer 1

Atomic radius decreases as one moves from left to right in a period.
As one moves from left to right in a period, there is consecutive addition of one proton in the nucleus and one electron in the valence shell of the element. However, the electron is always added in the same valence shell in a given period. The addition of proton in the nucleus increases the positive charge, which consequently pulls the extra-nuclear electrons in the outermost shell inward. Thus, the atomic radius decreases with the increase in the number of protons as one moves from left to right in a period.

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