Rhodium-99 (Rh-99)

Identity

Protons

45

Neutrons

54

Mass number

99

Mass

99 ± 21 u

Mass excess

-85.585 MeV

Spin

1/2-

Stability

Half-life: 16.1 days

Natural occurrence

Not found in nature

Decays to

• positron emission → Ru-99