science vocabulary crossword puzzle

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Across
  1. 3. small numbers next to a symbol
  2. 6. found on the periodic table
  3. 8. the opposite of a physical reaction
  4. 10. a group of atoms
Down
  1. 1. a kind of matter
  2. 2. proof of something
  3. 4. formula of chemicals
  4. 5. whats made after a chemical reaction
  5. 7. basic unit of a chemical element
  6. 9. has the same meaning of stop