Chemistry and more!

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Across
  1. 1. attracted to the elections in the nucleus
  2. 5. the total number of protons and neutrons in an atomic nucleus.
  3. 6. process that leads to the chemical transformation of one set of chemical substances to another.
  4. 8. a unit of measurement that denotes an amount of substance
  5. 9. the smallest unit of matter
  6. 11. The rarest natural occurring element
  7. 12. a substance with a specific composition
  8. 13. pure chemical substance composed of more than one element
  9. 14. chemical compound with the chemical formula CH4
  10. 15. the scientific study of life and living organisms
Down
  1. 2. small, dense region consisting of protons and neutrons at the center of an atom
  2. 3. a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
  3. 4. said to have first made the atom theory
  4. 7. attracted to the protons in the nucleus
  5. 10. word used to describe energy coming from a heat source
  6. 11. an ancient branch of natural philosophy, a philosophical and protoscientific tradition