Lead-203 (Pb-203)

Identity

Protons

82

Neutrons

121

Mass number

203

Mass

203.0 ± 7.0 u

Mass excess

-24.786 MeV

Spin

5/2-

Stability

Half-life: 2.16 days

Natural occurrence

Not found in nature

Decays to

• electron capture → Tl-203