Parts of an atom

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Across
  1. 7. A substance that cannot be broken down
  2. 9. Protons and neutrons are found in this
  3. 10. Name of the atom
  4. 11. Has all the elements listed
  5. 12. Number above the element on the periodic table
  6. 13. Extremely small and the basic unit of a chemical element
  7. 14. Represents the atom
Down
  1. 1. Found on the right side of the periodic table
  2. 2. Neutral charge
  3. 3. Electrons on the outermost shell
  4. 4. Positively charged
  5. 5. The energy level a valence electrons is part of
  6. 6. Negatively charged
  7. 8. Number below the element on the periodic table
  8. 15. Found on the left side of the periodic table