Untitled

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Across
  1. 2. The smallest particle of an element.
  2. 4. The smallest particle of compound that has the compound's properties.
  3. 6. The dense center of an atom.
  4. 8. A particle that has no charge in an atom.
Down
  1. 1. The number of protons in an atom.
  2. 3. A positive particle in an atom.
  3. 5. A negatively charged particle in an atom.
  4. 7. an atom of different number of protons than electrons.