Gold-199 (Au-199)

Identity

Protons

79

Neutrons

120

Mass number

199

Mass

198.97 ± 0.58 u

Mass excess

-29.094 MeV

Spin

3/2+

Stability

Half-life: 3.14 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Hg-199