Question

atomic size is always increases down give reason​

Answer 1

while going down along the groups in tune periodic table, one electron shell is added at every period.

thus, the atomic size increases.

Answer 2

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. This is caused by electron shielding