Question

atomic size is always increases down​

Answer 1

because down the group atomic no. increases and nuclear charge decreases...

Answer 2

hello mate

here is your answer...

I hope you understand

As you go left to right in periodic table,, you are adding more proton and neutrons to nuclei. the in the row further down have even more protons and electrons... Therefore atomic number increase from left to right and from top to bottom of the periodic table......