Dr. Gray's Awesome Crossword Puzzle

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