Across
- 2. Smallest amount of element that retains its properties
- 4. Number of protons in an atom
- 5. Other form of nitrogen available to plants
- 7. Found in nucleus of atom
- 11. Weathering of rock adds this to soil
- 12. Cannot be broken down to other substances
- 13. Bond that shares electrons
Down
- 1. Bond that transfers electrons
- 3. Positive ion
- 6. One form of nitrogen available to plants
- 8. Maximum number of electrons in third energy level
- 9. Electrons in outer-most shell of atom
- 10. Most abundant elements on earth