Across
- 1. Isotopes have a different number of..?
- 3. What type of energy is needed to start a reaction
- 7. What must occur between particles to react?
- 9. What type of test is used to identify metal ions?
- 10. Substances that only contain one thing are considered what?
Down
- 2. What is formed when halogens react with alkali metals?
- 4. How reactive are Group 1 metals
- 5. Ions with opposite charges form what type of bond?
- 6. Biological catalysts
- 8. Iron reactions with oxygen and what else to form rust?