Chemistry Puzzle

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Across
  1. 3. The smallest element of a particle
  2. 5. a reaction in which two or more substances combine to form a single new substance
  3. 7. The substance created by one or more of the same atom
  4. 8. The base unit of amount of pure substances
  5. 9. The transfer of electrons from one atom to another permanently
  6. 11. number of units in one mol
  7. 12. A reaction in which a compound breaks down into two or more simpler substances
  8. 13. A reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds
Down
  1. 1. A pure substance that consists of atoms by chemical means
  2. 2. A balanced substance made by the sharing of two atoms
  3. 4. number The sum of the # of protons and neutrons in a nucleus
  4. 6. A reaction in which one element replaces a similar element in a compound
  5. 10. A substance made by a mixture of more than one kind of atom