When can the fourth and third energy shells hold more?

4th Shell4s, 4p, 4d, 4f2 + 6 + 10 + 14 = 32

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.