Dr. Gray's Awesome Crossword Puzzle

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Across
  1. 3. A system of millions or billions of stars, the Milky Way
  2. 7. sugar, gasoline, methane
  3. 9. The world's first polymath, first multi-genius
  4. 12. The degree of compactness of a sustance
  5. 13. My atomic number is 13
  6. 14. A non-crytalline amorphous solid
  7. 15. Not really Pb, but its in your pencils
  8. 18. Closest planet to the Sun, element symbol Hg
  9. 19. energy in motion
  10. 20. Any of two or more forms of an element, having the same number of protons in the nucleus, with a different number of neutrons in the nucleus.
Down
  1. 1. Highly compressed carbon
  2. 2. This force resists motion, resulting in heat
  3. 4. The spliting of an atom
  4. 5. The medieval forerunner of chemistry, based on the supposed transformation of matter.
  5. 6. A Hollywood theater, atomic number 46
  6. 8. A process in which the nuclei of atoms are joined
  7. 10. A 4th state of matter not solid, liquid or gas, present in stars and fusion reactors
  8. 11. Two of this + 1 oxygen makes water
  9. 16. A particle of matter with the same mass as an electron but an opposite charge
  10. 17. Force that attracts a body to another body with mass