Question

How do atomic radius vary in a period and in a group ? How do you explain the variation.
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Answer 1

atomic radius decrease going along the group because electrons are added in the same shell and the attractive force between electrons and nucleus is increased therefore atomic radius decreases.

while going along a group atomic radius increase because there is increase in number of shells

Answer 2

Answer ↪

⭕In a group , atomic radii increase from top to bottom due to increase in the number of shells and also increase in the screening effect of the inner electrons.

⭕ In a period , atomic radii decrease from left to right in a period because within the period the outer electrons are added in the same valence shell and effective charge increase as the atomic number increase resulting in the increased attraction of electrons to the nucleus.

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#Har_Har_Mahadev ♥