Someone help for 4 and 5. Ill give 50 points

the answer for sodium is 0.186

the answer for rubidium is 0.251

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.