Across
- 2. group 16 from the periodic table
- 6. alkali metals are highly ...............
- 7. element with the symbol Ca
- 8. makes up nearly 80% of the air we breathe
- 10. made up of at least 2 atoms
- 12. positive subatomic particle
- 15. number of electrons that can fit in the 2nd electron shell
- 16. Groups 3-12 from the Periodic Table
- 17. number of electrons that can fit in the first electron shell
Down
- 1. Group 17 from the Periodic table
- 3. Group 1 from the periodic table
- 4. the most reactive alkali metal
- 5. smallest unit of matter
- 8. found in the centre of the atom
- 9. Group 18 from the periodic table
- 11. the most reactive halogen
- 13. element with the atomic number 10
- 14. made up of at least 2 different atoms