Pb

Lead-199m

Protons (Z)

82

Neutrons (N)

117

Mass number

199

Half-Life

12.2 m

Abundance

---

Mass

198.973 u

Mass Excess

-24,803.0 keV

Spin

(13/2+)

Discovered

1955

Binding energy per nucleon

7,874 keV

Neutron separation energy

6,807 keV

Proton separation energy

4,563 keV

Decay Mode

Decay chain

Lead-199Z 82 · N 11712.2 m
γ100%
β⁺100%
β⁺100%