X, Y and Z are three hydrocarbons. What do compounds X, Y and Z have in common? (1) They are all alkenes. (2)They are all part of the same homologous series. (3)They all have the same boiling point.

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.

4d^55s^1 ( third choice)