Periodic table
Across
- 2. chemical symbol Li
- 4. when two or more substances are chemically bonded
- 7. ____ metals. Most reactive group in the periodic table
- 9. group 8 in the periodic table
- 10. chemical symbol He
- 12. columns
- 13. made the modern periodic table
Down
- 1. Used in nuclear power plants
- 3. group 7 in the periodic table
- 5. rows
- 6. chemical symbol C
- 7. ____ earth metals group 2
- 8. how many oxygen atoms does Carbon Dioxide contain
- 10. atomic number 1
- 11. A substance that is made of two or more substances not chemically bonded