Matter Crossword

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Across
  1. 2. has no charge
  2. 4. most likely location in electron cloud
  3. 5. average of the masses of the existing isotopes of an element
  4. 8. the smallest particle of an element
  5. 9. number of protons in a nucleus
  6. 10. has a negative charge
Down
  1. 1. central core of an atom
  2. 3. a substance that cannot be broken down into any other substance
  3. 6. anything that has mass and takes up space
  4. 7. have a positive charge