Chemistry Crossword

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Across
  1. 2. The number that appears in the upper left corner
  2. 5. Equal protons, varying neutrons
  3. 6. Ion with a negative charge
  4. 8. Group with both properties of metals and nonmetals
  5. 10. Fluorine and chlorine are…
  6. 14. Vertical columns on the periodic table
  7. 15. Subatomic particle with a positive charge
  8. 17. Atomic numbers 89-103
  9. 18. First group on periodic table
  10. 19. Subatomic particle that exists in the nucleus and does not have a charge
  11. 20. Scientist who innovated the periodic table
Down
  1. 1. Ion with a positive charge
  2. 3. Element associated with dairy
  3. 4. Horizontal rows on the periodic table
  4. 7. Atomic number 12
  5. 9. Atomic numbers 57-71
  6. 11. Atomic number 5
  7. 12. Sum of the number of protons and neutrons in an atom
  8. 13. Heaviest stable halogens
  9. 16. Symbol Pt