Polyatomic ions such as ammonium ions and nitrate ions are ions that consist of

i believe it is c.) 1575 j.

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)