Periodic Table Crossword Puzzle

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Across
  1. 3. left to right on the table
  2. 5. things that represent on something
  3. 7. smallest thing on earth
  4. 9. no charge
Down
  1. 1. negative charge
  2. 2. up and down on the table
  3. 4. these are on the periodic table
  4. 6. protons and electrons
  5. 8. positive charge