atoms

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Across
  1. 4. middle of atom
  2. 6. element
  3. 7. building blocks of matter
  4. 8. identify
  5. 10. positive subatomic particle in a atom
Down
  1. 1. protons + neutrons
  2. 2. no charge
  3. 3. atomic mass number
  4. 5. negative charge
  5. 9. periodic table