DOWN

Down (d): Slightly heavier than the up quark, with a charge of -1/3

Mass: ~4.7 MeV/c²
Stable in nucleons
Forms: Neutrons (udd), Protons (uud)
Decays: In isolation, down quark can decay via weak force (d → u + W⁻) in beta decay (neutron → proton)

Down (d): and anti-down (d̄)