The Standard Model of Matter

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Across
  1. 4. weakest of the four fundamental forces
  2. 6. particle with no substructure
  3. 11. the six classifications of quark types
  4. 12. nuclear force mediated by W and Z bosons
  5. 13. number of quarks in mesons
  6. 16. the destructive process resulting when a particle meets its antiparticle
  7. 18. family of particles with one quark and one antiquark
  8. 19. a particle with the same mass and opposite charge to a corresponding particle
  9. 22. family of particles that includes protons and neutrons
Down
  1. 1. particle carrying force
  2. 2. antiparticle of an electron
  3. 3. particle formed in cosmic rays in upper atmosphere
  4. 5. hypothetical particle mediating the gravitational force
  5. 7. attractive force that acts between quarks
  6. 8. type of elementary particle
  7. 9. the gauge boson that mediates the strong force
  8. 10. physics of very small particles
  9. 14. number of quarks in baryons
  10. 15. existing in discrete amounts
  11. 17. a family of particles that includes the electron
  12. 20. gauge boson mediating the electromagnetic force
  13. 21. third generation lepton