Generation I
Generation II
Generation III
I+⅔
u
Up
2.2 MeV/c²
II+⅔
c
Charm
1.275 GeV/c²
III+⅔
t
Top
172.76 GeV/c²
I−⅓
d
Down
4.7 MeV/c²
II−⅓
s
Strange
95 MeV/c²
III−⅓
b
Bottom
4.18 GeV/c²
I0
νₑ
e-Neutrino
<2.2 eV/c²
II0
νμ
μ-Neutrino
<0.17 MeV/c²
III0
ντ
τ-Neutrino
<18.2 MeV/c²
I−1
e
Electron
0.511 MeV/c²
II−1
μ
Muon
105.66 MeV/c²
III−1
τ
Tau
1776.86 MeV/c²
— antiparticles not shown —