Matter

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Across
  1. 2. anything with volume and mass
  2. 4. depressed particle
  3. 8. the sum of protons and neutrons in an atoms nucleus
  4. 9. a happy particle
  5. 10. an atom that loses an electron
Down
  1. 1. number of protons in an atoms nucleus
  2. 3. indifferent particle
  3. 5. the most basic kind of matter that cant be broken down
  4. 6. the smallest particle of an element
  5. 7. atoms of the same element but different mass