Atoms Crossword Puzzle

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Across
  1. 2. The amount of protons in as element
  2. 4. The letter represented by the element
  3. 6. were electrons located
  4. 8. were protons and neutrons are located
  5. 9. Protons + Neutrons
Down
  1. 1. positive energy level
  2. 3. the number to the right of the periodic table
  3. 5. The number on top of the periodic table
  4. 7. when 2 elements combine