atom review/challenge yourself

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Across
  1. 1. sorting elements
  2. 4. neutral
  3. 6. number of the proton in the nucleus
  4. 7. positive
  5. 8. something built or constructed
  6. 10. cannot change the indentity of matter
  7. 11. the amount of space an object takes up
  8. 13. entirely made up of one type of atom
  9. 14. the region of the negative charge
  10. 15. negative
  11. 16. particle smaller than atomi ie proton
  12. 17. mass of an atom
Down
  1. 1. characteristic of an object
  2. 2. the smallest component of an element
  3. 3. when a negative and positive make a zero
  4. 4. the center of an atom
  5. 5. what it does
  6. 9. anything that has mass or matter
  7. 12. property of a subatomic particle