Unit 1 Crossword Puzzle

1234567891011121314151617181920
Across
  1. 6. The numerical value of each of the ion charges is crossed over
  2. 8. Atoms with different numbers of neutrons
  3. 9. Neutral charge
  4. 10. Hydrogen
  5. 15. Horizontal rows of the periodic table
  6. 16. Number of protons in an element
  7. 18. Iron
  8. 19. A substance that forms hydrogen ions when dissolved in water
  9. 20. Elements with similar properties
Down
  1. 1. Number of protons and neutrons combined
  2. 2. Group of atoms that have any charge
  3. 3. Group of atoms with a negative charge
  4. 4. Group of atoms with a positive charge
  5. 5. Negative charge
  6. 7. Sodium or Potassium
  7. 11. One or two letter abbreviations for a chemical element name
  8. 12. Either positive or negative
  9. 13. Shows the elements that make up the compound and the numbers of atoms
  10. 14. Helium
  11. 17. Positive charge