Chemistry crossword

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Across
  1. 4. naturally-occurring chemical element found in rock in the earth's crust, including in deposits of coal.
  2. 5. chemical element with the symbol K and atomic number 19.
  3. 9. a reaction or process accompanied by the release of heat.
  4. 10. chemical element with the symbol Mg and atomic number 12.
  5. 11. a reaction or process accompanied by or requiring the absorption of heat.
  6. 12. particle that consists of a nucleus of protons and neutrons surrounded by an electromagnetically-bound cloud of electrons.
  7. 13. chemical element with the symbol Al and atomic number 13
Down
  1. 1. a cylindrical container with a flat bottom
  2. 2. a naturally occurring element that is a liquid at room temperature
  3. 3. not related to, involving, or produced by chemicals.
  4. 6. a substance that dissolves a solute, resulting in a solution.
  5. 7. the formation of a chemical bond between two or more atoms, molecules or ions to give rise to a chemical compound.
  6. 8. highly resistant to chemical attack and has the highest strength to weight ratio of any metal