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