Physics

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Across
  1. 4. subatomic particle with a positive charge
  2. 7. causes change in motion
  3. 9. speed with a direction
  4. 12. a pure substance that can't be broken down
  5. 13. the smallest unit or part of an element
  6. 14. the distance an object travels and the time it takes to travel that distance
  7. 16. subatomic particle with a neutral charge
  8. 17. a pulling force that pulls all objects to the center of the earth
  9. 18. semiconductors
Down
  1. 1. a substance made of two or more different elements bonded together
  2. 2. rows on the periodic table that tell us how many shells each atom has
  3. 3. a push or pull
  4. 5. causes no change in motion
  5. 6. mostly gas and found on the right side of the periodic table
  6. 8. a change in speed or direction of an object
  7. 10. shiny substances found on the left side of the periodic table
  8. 11. columns on the periodic table that tell us how many valence electrons each atom has
  9. 15. subatomic particle with a negative charge