APEMAN :)

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Across
  1. 3. Proton
  2. 5. Positive
  3. 7. Neutron
Down
  1. 1. number Atomic number
  2. 2. mass Atomic mass
  3. 4. Negative
  4. 5. table periodic table
  5. 6. Electron
  6. 8. Neutral