Across
- 4. representation of the composition of a compound
- 8. one of the base physical quantities
- 9. the closeness of the measured values to each other
- 11. subatomic particle
- 12. the number of protons in the nucleus
- 13. atoms that have the same number of protons but different number of neutrons
Down
- 1. solid turns to gas
- 2. change in which heat released by a system into its surroundings
- 3. gas turns to liquid
- 5. positively charged ion
- 6. one of the three main states of matter
- 7. a prefix representing one millionth
- 10. pure substance