Dr. Gray's Awesome Crossword Puzzle

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