Dictionary of Science!

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Across
  1. 2. a grouping of atoms bonded together
  2. 4. particles used as building blocks
  3. 5. when 2 or more elements combine
  4. 8. indicates the amount of an atom in a molecule
  5. 9. a substance that is unbreakable
  6. 11. words)- a singular element
Down
  1. 1. the result of chemical reactions
  2. 3. the reaction of separating different elements
  3. 6. a number that represents the amount of molecules
  4. 7. takes part in chemical reaction, on left side of arrow
  5. 10. the amount of matter in an item