The red arrow is pointed at different locations of an atom of helium. where is it pointing to the greatest concentration of atomic mass?

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.

c, liquids evaporate, creating a gas