Across
- 2. chemical compound with the chemical formula CH4
- 6. a unit of measurement that denotes an amount of substance
- 7. an ancient branch of natural philosophy, a philosophical and protoscientific tradition
- 9. The rarest natural occurring element
- 10. pure chemical substance composed of more than one element
- 11. the scientific study of life and living organisms
Down
- 1. a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
- 3. the smallest unit of matter
- 4. said to have first made the atom theory
- 5. process that leads to the chemical transformation of one set of chemical substances to another.
- 8. a substance with a specific composition