Chapter 2: Periodic Table, Atoms & Molecules The Periodic TableChemical Symbols Anatomy of an AtomAtomic StructureHistory of the atomIsotopesAtomic Mass (AMU) Atom versus CompoundDifference between an atom and a compound/moleculePolyatomic ionsNaming inorganic compoundsIonic compoundsCovalent compoundsChemical formula The MoleFormula MassThe Mole