Question

What happend to the size of atom down a group and across a period?

Answer 1

The size of atom coming Down the group increase generally due to increase in no of shell.pls mark my and brainleast.

Answer 2

ACROSS THE PERIOD

Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus

DOWN THE GROUP

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. 2) As you move across a period, atomic radius decreases.

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