crossword puzzle

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Across
  1. 7. Where electrons are when they surround the nucleus
  2. 10. A stable subatomic particle with a positive charge
  3. 11. Term for columns in periodic table also known as families
Down
  1. 1. An electron that can participate in atom fusion
  2. 2. A stable subatomic particle with no charge
  3. 3. A substance that is formed as the result of a chemical reaction
  4. 4. A stable subatomic particle with a negative charge
  5. 5. A substance that takes part in a reaction
  6. 6. The positively charged central core of an atom
  7. 8. The term used to describe the rows in the periodic table
  8. 9. A body of coherent matter usually of indefinite shape