Atoms and reactions

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Across
  1. 2. Negatively charged particle which orbits the nucleus
  2. 4. Chemical symbol for a molecule or compound
  3. 6. Two or more atoms bonded together
  4. 7. Substances which take part in a reaction
  5. 9. Number of protons and neutrons added together (2 words)
  6. 13. Number of protons
  7. 15. Substances produced by a reaction
  8. 17. Two or more elements bonded together
  9. 18. Temperature at which a solid melts (2 words)
  10. 20. Layers in which electrons orbit (2 words)
Down
  1. 1. Disintegration of materials to their constituent atoms
  2. 3. Burning fuels in oxygen
  3. 5. Able to be bent and hammered into shape
  4. 8. Simple chemical containing only one type of atom
  5. 10. Positively charged particles in the nucleus
  6. 11. Contains both protons and neutrons
  7. 12. Able to be stretched to a wire,
  8. 14. Atom or group of atoms which has lost or gained electrons
  9. 16. A substance which allows heat and electrical current to pass through it
  10. 19. Neutral particle found in the nucleus
  11. 21. Adding a layer of zinc to a metal