Periodic Table/Atomic Structure Review

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Across
  1. 5. horizontal rows on the Periodic Table
  2. 6. particle that has no charge
  3. 7. number the number of protons in the nucleus
  4. 8. positively charged particle
Down
  1. 1. center of atom that contains proton and neutrons
  2. 2. negatively charged particle
  3. 3. mass protons + neutrons
  4. 4. vertical columns on the Periodic Table