MOLECULE - wo or more atoms connected by chemical bonds,, ISOTOPES - have the same number of protons but different numbers of neutrons, NEUTRON - neutral electric charge, OXYGEN - a chemical element with an atomic number of 8, ELECTRON - subatomic particle with a negative electrical charge, PROTON - a subatomic particle with a positive electrical charge., ION - an atom or group of atoms that carries a positive or negative electric charge, COMPOUND - two or more different elements in definite proportions joined by chemical bonds into a molecule., ATOM - tiny visible particle of elements, CATION - are ions that are positively charged, ANION - an ion with negative charge,,

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