Molybdenum-99 (Mo-99)

Identity

Protons

42

Neutrons

57

Mass number

99

Mass

98.91 ± 0.24 u

Mass excess

-85.970 MeV

Spin

1/2+*

Stability

Half-life: 2.75 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Tc-99