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