Iodine-125 (I-125)

Identity

Protons

53

Neutrons

72

Mass number

125

Mass

124.9 ± 1.5 u

Mass excess

-88.836 MeV

Spin

5/2+*

Stability

Half-life: 59.4 days

Natural occurrence

Not found in nature

Decays to

• electron capture → Te-125