Group 3-crossword

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Across
  1. 4. a stable subatomic particle occurring in all atomic nuclei
  2. 7. as the force of gravity on the object
  3. 9. a stable subatomic particle with a charge of negative electricity
  4. 10. Attraction that every object have for each other
  5. 13. any of a number of subatomic particles carrying a fractional electric charge
  6. 15. hadronic subatomic particles composed of one quark and one antiquark
  7. 16. move or travel with great speed or force
  8. 17. my name is
  9. 19. The smallest, inseparable particle of all things
Down
  1. 1. strength or energy as an attribute of physical action or movement
  2. 2. a group of atoms bonded together
  3. 3. the Standard International unit of force
  4. 5. a cosmological model for the observable universe from the earliest
  5. 6. a subatomic particle of about the same mass as a proton
  6. 8. the positively charged central core of an atom
  7. 11. an atomic mass unit
  8. 12. the work done passing one amp through a resistance of one ohm for one second
  9. 14. my teacher calls himself
  10. 15. an elementary particle similar to the electron
  11. 18. the fundamental unit of length in the metric system