Across
- 2. number placed in front of the symbol
- 4. two or more elements
- 6. a molecule consisted of two atoms
- 9. reaction that forms oxide and produces heat
- 11. gain of electrons
- 12. charged atom or molecule
- 13. an element combines with oxygen
Down
- 1. one element is substituted
- 3. negatively charged subatomic particle
- 5. combined elements seperating
- 7. two elements combining into one
- 8. one element switches on both sides
- 10. number below the symbol