Which statement explains why low temperature and high pressure are required to liquefy chlorine gas?
(1) chlorine molecules have weak covalent bonds.
(2) chlorine molecules have strong covalent bonds.
(3) chlorine molecules have weak intermolecular forces of attraction.
(4) chlorine molecules have strong intermolecular forces of attraction.

the atomic mass is the bottom number on the element.

-steel jelly

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.