Science Crossword Puzzle

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Across
  1. 1. The charge of an electron
  2. 3. Basic substance, pH above 7
  3. 6. Reaction type that releases heat
  4. 7. Process of combining elements to form compounds
  5. 9. The smallest unit of matter
  6. 10. Chemical reaction result
Down
  1. 2. The process of a liquid turning into gas
  2. 4. A type of chemical bond formed by sharing electrons
  3. 5. A measure of acidity
  4. 7. Substance that speeds up a chemical reaction
  5. 8. The chemical symbol for gold