First group, Best group

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Across
  1. 2. particles proton, neutron, electron
  2. 4. Tomography rotating X-ray source creating cross-sectional images
  3. 6. fundamental building blocks in matter
  4. 7. the glow of a fluorescent material
  5. 8. same number of protons, different number of neutrons
  6. 10. radiation radiation capable of removing an orbital electron
  7. 13. the ability to do work
  8. 15. spontaneous emission of particles and energy
  9. 16. System number system based on multiples of 10
  10. 17. smallest particle with properties of an element
  11. 19. of conservation of energy energy cannot be created or destroyed
  12. 20. a push or pull on an object
  13. 21. the largest source of natural environmental radiation
Down
  1. 1. product of mass and velocity
  2. 3. anything that occupies space
  3. 5. speed or rate of position change with time
  4. 6. rate of change of velocity
  5. 9. Energy the ability to do work in motion
  6. 11. Energy energy contained within the nucleus of an atom
  7. 12. tube vacuum tube allowing control of X-ray intensity and energy
  8. 14. energy emitted and transferred through space
  9. 18. Atom dense nucleus with orbiting electrons