Fundamental Forces

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Across
  1. 3. gravity is a fundamental ___
  2. 4. chemistry is based on chemical ____
  3. 8. protons and electrons have positive and negative __
  4. 9. the strong force binds _____ together
  5. 10. 3d fundamental force
  6. 12. 2nd fundamental force
  7. 14. 4th fundamental force
  8. 16. _____ is the most powerful force
  9. 17. 1st fundamental force
Down
  1. 1. collection of protons (+) and neutrons (neutral)
  2. 2. the weak force is responsible for radioactive ____
  3. 5. gravitational, elastic, and chemical are all types of ____
  4. 6. a type of bomb and energy
  5. 7. stable subatomic particle (+)
  6. 11. a space filling substance
  7. 13. a small portion of matter
  8. 15. the 4 ____ forces