Notice that two of the Delta baryons look identical in composition to the neutron and proton.  The difference lies in the way the spins of the quarks are aligned.  In the Deltas, all three quark spins are aligned, while in protons and neutrons one of the three is always opposite the other two.  Deltas are unstable and quickly decay into a neutron or proton plus a pion (pi meson) of appropriate charge. 

Baryons - Delta Particles

1st Generation 2nd Generation 3rd Generation
"Up"
Type Quarks
Up Quark
Mass:   1.87-2.15 MeV
Charge:
2/3
Spin:    
1/2
ID:            u, u
Charm Quark
Mass:   1.18-1.34 GeV
Charge:
2/3
Spin:    
1/2
ID:            c, c
Top Quark
Mass:  172.6-173.6 GeV
Charge:
2/3
Spin:    
1/2
ID:            t, t
"Down" Type Quarks
Down Quark
Mass:    4.63-4.95 MeV
Charge:
-1/3
Spin:    
1/2
ID:            d, d
Strange Quark
Mass:    90-100 MeV
Charge:
-1/3
Spin:    
1/2
ID:            s, s
Bottom Quark
Mass:    4.2 or 4.68 GeV
Charge:
-1/3
Spin:    
1/2
ID:            b, b
Quark Summary                   (compiled from a number of different sources)
Particle Type
Click name for more:
Quark Composition Rest Mass
in MeV
Proton uud 938.3
Neutron ddu 939.6
Lambda
Charmed Lambda
Bottom Lambda
Top Lambda
uds
udc
udb
udt
1,115.6
2,281.0
5,620.2
----------
Sigma
Delta uuu, uud, udd, ddd 1232.0
Xi
Omega
Physics

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Composite Particles
WILLIAM & DEBORAH HILLYARD
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