Atom Crossword Puzzle

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Across
  1. 3. a pure substance on made of one type of atom
  2. 5. negative subatomic particle on the outside of the nucleus
  3. 8. substance that has mass and takes up space
  4. 10. the number on the periodic table that tells the number of protons
  5. 11. a substance composed of two or more elements
  6. 12. a small number written slightly below the chemical symbol indicating the number of atoms in the element
Down
  1. 1. positive subatomic particle in the nucleus of the atom
  2. 2. neutral subatomic particle in the nucleus of the atom
  3. 4. the starting materials in a reaction that undergo a chemical change to form a product.
  4. 6. the smallest part of a substance that cannot be broken down
  5. 7. the number on the periodic table that is the sum of the protons and neutrons
  6. 9. the substance that is formed as a result of a chemical reactions