Atoms are the smallest particles of matter. b. The mass of an iron atom is different from the mass of a copper atom. c. Every atom of silver is identical to every other atom of silver. d. A compound is composed of atoms of two or more different elements.
I've always been told that it's eight. This is only because the atom has to have the saem protons (positively charged) neutrons and electrons (negatively charged). However this does not occur with all atoms. :)
