Energy is conserved
Charge is conserved
Lepton number is conserved
Baryon number is conserved
Strangeness is conserved in strong interaction but not weak
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Hadron
Particles made of quarks
Baryon/meson
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Baryon
3 quarks or 3 anti quarks
Baryon number 1/-1
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Meson
A quark and anti quark pair
Pion = up and down quarks
Kaon = up, down and strange quarks
Baryon number 0
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Lepton
Particle not made of anything else
Electrons, muons etc
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Quarks
Up - baryon number 1/3, charge +2/3
Down - baryon number 1/3, charge -1/3
Strange - baryon number 1/3, charge -1/3, strangeness -1
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