SCIENCE :)

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Across
  1. 2. remains unchanged
  2. 4. equal in size going opposite way
  3. 6. anything that has volume or mass
  4. 9. Average of many measurements
  5. 11. Basic unit of an element
  6. 12. a row in a periodic table
Down
  1. 1. Size of displacement between two positions
  2. 3. negative charge of a particle
  3. 5. push or pull
  4. 7. energy energy with motion
  5. 8. the mass of an atom
  6. 9. Basic unit of life
  7. 10. charge negative or positive charges