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