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Across 2. A compound containing only carbon and hydrogen 7. Mass of the isotpoe compared with 1/12th of carbon 12 (3 Words) 8. electrostatic attraction between oppositely charged ions (2 Words)

Down 1. Energy need to remove an electron from each atom in one mole of gaseous atoms (3 Words) 3. As many particles as there are carbon atoms in 12 g of carbon 12 (5 Words) 4. A group of atoms or part of a molecule that give a compund its characteristic set of reactions (2 Words) 5. the weighted mean mass of an atom of an element (3 Words) 6. A region that can hold up to two electrons