Periodic trends in atomic radius

https://www.youtube.com/watch?v=mbIkDqzdyFE

What happens to atomic radius as we move across a period

As we move across period from left to right, the atomic radius decreases.

What happens as we move across a period

Each element has onemore proton in its nucleus than the element before

So pos charge in nucleus increases across the period

Because of this increased positive charge, there is an increased attraction between the nucleus and the electrons, drawing electrons closer to the nucleus.

This causes the atomic radius to decrease across the period.

What happens to atomic radius moving down a group

It increases.

The number of electron shells increase as we move down the group. so outer electron shell is further from the nucleus.

Each element has one more full inner electron shell.

This increases amount of shielding between the nucleus and the outer electron

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