elements

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Across
  1. 3. the smallest particle of matter
  2. 4. the weakest form of radiation
  3. 8. two or more elements that can be physically separated
  4. 9. the particle with no charge in an atom
  5. 10. the positively charged particle in an atom
Down
  1. 1. a radioactive element
  2. 2. two or more elements that cannot be physically separated
  3. 5. the strongest form of radiation
  4. 6. the medium strength of radiation
  5. 7. the negatively charged particle in an atom