Question

atomic radius goes on incresing down agroup

Answer 1

this is caused by increase in number of protons and electrons across a period one protons has a greater effect then one electron thus elctrons are pull towards the nucleus resulting in a smaller radius. atomic radius increases from top to bottom within a group.this is caused by elctron shielding.

Answer 2

ATOMIC RADIUS GOES ON INCREASING DOWN THE GROUP AS NEW SUBSHELLS ARE ADDED  TO THE ELEMENT