Anatomy of an Atom

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Across
  1. 2. a neutrally charged particle
  2. 4. an atom that is not balanced
  3. 6. a negatively charged particle
  4. 7. the orbit of electrons
  5. 8. an individual group of particles
Down
  1. 1. a positively charged particle
  2. 3. made up of protons and neutrons
  3. 5. a pure substance