Bi

Bismuth-209

Protons (Z)

83

Neutrons (N)

126

Mass number

209

Half-Life

20.1 Ey

Abundance

100%

Mass

208.98 u

Mass Excess

-18,258.6 keV

Spin

9/2-

Discovered

1924

Binding energy per nucleon

7,848 keV

Neutron separation energy

7,460 keV

Proton separation energy

3,799 keV

Decay Mode

αThallium-205100%

Decay chain

Bismuth-209Z 83 · N 12620.1 Ey
α100%