The Periodic Table

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Across
  1. 5. particle with a negative charge
  2. 6. Horizontal rows on the periodic table
  3. 7. symbol on the periodic table is U
  4. 10. Group 18 on the periodic table
  5. 13. particle with a neutral charge
Down
  1. 1. particle with a positive charge
  2. 2. Atomic number is 1
  3. 3. Atomic number 19
  4. 4. the number of protons in an atom
  5. 8. Atomic number is 82
  6. 9. symbol on the periodic table is C
  7. 11. symbol on the periodic table is O
  8. 12. vertical columns on the periodic table