Crossword of all units

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Across
  1. 3. a stable subtopic partical occurring in all atomic nuclei
  2. 5. body uses to make vitamin b
  3. 8. speed with a direction
  4. 10. when two waves overlap and combine together
  5. 11. where there is a release of alpha particals
  6. 12. Total pe and ke of the particles in an object
  7. 13. Distance between one wave and the next
  8. 14. a disturbance in matter that carries energy from one place to another
  9. 16. A wave in which the vibration of the medium is parallel to the direction of travel
  10. 17. charged particles and energy that are emitted from the nuclei of the radiation isotopes
  11. 20. a circuit with one pathway
  12. 21. the resistance created b/w two objects sliding against each other
Down
  1. 1. the number of protons in the nucleus of the atom
  2. 2. the direction from the start
  3. 4. force applied to the mechine
  4. 6. the force of attraction/repulsion b/w wo objects
  5. 7. a measure of the force amplification achieved by using a tool
  6. 9. the interval of time b/w successive occurrences of the same state in an cyclic phenominon
  7. 15. a set of values in relation to which measurement or judgment can be made
  8. 18. A push and pull that results in motion
  9. 19. Transfer of thermal energy by waves moving through space