Why does the size of the atom of elements increases down a group and decreases when you move across?

Question

Chemistry

Maliyah Roman

15 November, 01:08

Why does the size of the atom of elements increases down a group and decreases when you move across?

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Kenna · Answer 1

This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. Atomic radius increases from top to bottom within a group.