Chemestry/Energy Vocabulary Puzzle

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Across
  1. 4. A type of metal
  2. 6. Able to dissolve
  3. 8. A basic unit of a chemical element
  4. 9. How compact something is
  5. 11. A type of fuel we use
Down
  1. 1. Heat derived within the sub serfice of the earth
  2. 2. Flowing energy
  3. 3. The center most important part
  4. 5. Horizontal row in periodic table
  5. 7. Making a decision during this
  6. 10. Something composed of two or more elements
  7. 12. gets dissolved