Across
- 5. Relating to ions
- 7. Different version of an element
- 8. Negatively charged subatomic particle
- 10. Row of periodic table
- 11. High melting points
- 12. Column of periodic table
- 13. Negatively charged ion
Down
- 1. The outermost electron shell
- 2. Positively charged ion
- 3. Repeating 3d arrangement of atoms
- 4. The central mass of an atom
- 6. Brittle
- 9. 3rd element in group 1