Chemistry

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Across
  1. 2. number placed in front of the symbol
  2. 4. two or more elements
  3. 6. a molecule consisted of two atoms
  4. 9. reaction that forms oxide and produces heat
  5. 11. gain of electrons
  6. 12. charged atom or molecule
  7. 13. an element combines with oxygen
Down
  1. 1. one element is substituted
  2. 3. negatively charged subatomic particle
  3. 5. combined elements seperating
  4. 7. two elements combining into one
  5. 8. one element switches on both sides
  6. 10. number below the symbol