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Across 2. An subatomic particale with a neutral charge 5. The mass of an atom of a chemical element expressed in atomic mass units ; Normally a decimal (2 Words) 6. A substance that cannot be chemically interconverted or broken down 8. Positively charged ion 9. The horizontal row on a periodic table 10. Smallest form of matter 11. The vertical section of periodic table

Down 1. When two elements or substances are put together to form another substance 3. The positively charged central core of an atom 4. Contain equal numbers of protons but different numbers of neutrons 7. Negative charged ion 9. A subatomic particle occurring in all elements, with a positive electric charge