Across
- 2. has Atomic number 27.Atomic mass 59.
- 4. Looks like a container full of air.
- 7. Is frequently used in soap and glass.
- 10. Discovered in 1774.
- 11. is the second most abundant element on the planet.
- 12. has 31 protons.
- 13. has 12 neutrons.
Down
- 1. Physical Property is silver.
- 3. Chemical symbol Cu.
- 5. Atomic mass is 47.867(48)
- 6. discovered by Antoine Lavoisier.
- 8. Atomic number is 11.
- 9. !0% of weight of living organisms is hydrogen.
- 10. Calcium is in the food.