Question

How does atomic radius change from top to bottom in a group in the periodic table?

It tends to decrease.
It tends to increase.
It first increases, then decreases.
It first decreases, then increases.

I believe it's A
It tends to decrease.

Answer 1

Well see it for yourself:
http://www.ptable.com/?lang=en#Property/Radius/Calculated

Answer 2

Going from the top to the bottom increase the atomic radius.

Answer 3

That's correct :)