An element has the chemical symbol c. this means that the element a. is made up of only chlorine atoms. b. is made up of both carbon and oxygen atoms. c. is made up of only carbon atoms. d. is made up of several different kinds of atoms.

Phosphorous can form an ion called phosphide, which has the formula p3−. this ion can form an ion called phosphide, which has the formula p3−. this ion properties very similar to those of pforms when a phosphorus atom loses three protonsis called a cationcontains 18 electrons