chemistry

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Across
  1. 3. about the same mass of a proton
  2. 5. physical substance
  3. 6. a central and most important part of a element
  4. 9. mass cannot be created or destroyed
  5. 10. The ability to be stretched into a thin wire
Down
  1. 1. capable of being shaped
  2. 2. something manufactured or refined to scale
  3. 4. a concrete large body of matter
  4. 7. a participial with a negative charge
  5. 8. basic unit of a chemical element