Osmium-191 (Os-191)

Identity

Protons

76

Neutrons

115

Mass number

191

Mass

190.96 ± 0.71 u

Mass excess

-36.395 MeV

Spin

9/2-

Stability

Half-life: 15 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Ir-191