Why do you think the Cl -ion is larger than a neutral Cl atom?

Cl- (having a larger number of electrons with the same number of protons means that there will be less of a pull on the valence electrons from the nucleus. This means it will become larger).

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.