As you move down a column what happens to the ionic radius?

The ionic radius increases.  

Each time you move down to the next Period, you are adding an extra shell of electrons.

Each shell is further from the nucleus than the one before it, so the .

The image below illustrates the increase in ionic radius as you go down a Group.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.