Which element has a larger ionic radius; Aluminum or Boron.and how can you tell using a periodic table?

Does the ionic radius increase or decrease along a period on the periodic table?

Aluminum has a larger radius because there are more shells of electrons around its nucleusAtomic radius increases down a group for that reasonIt actually decreases to the right within a period because there are the same number of shells, but more protons pulling in on the electrons.

impossible without densityi mean 12inchX12 inch could be 1 0000000000 aluminum atom per inch or 1 000000000000000000000000000 aluminum atom per inch