Question

How do atomic radii vary in a group and a period how do you explain the variation?

Answer 1

Explanation:

in a period as we go left to right the proton no increases so does the energy of the nucleus....so it attracts the vslence shell more...thus atomic radii decreases along a period

along a group as we go down shell no. increases by 1 ....so radii increases

Answer 2

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In general, the atomic radius decreases as we move from left to right in a period with an increase in nuclear charge of the element. The atomic radius increases when we go down a group because of the addition of extra shell.