Iodine-126 (I-126)

Identity

Protons

53

Neutrons

73

Mass number

126

Mass

125.9 ± 4.1 u

Mass excess

-87.910 MeV

Spin

2-*

Stability

Half-life: 12.9 days

Natural occurrence

Not found in nature

Decays to

• positron emission 52.7 % → Te-126
• beta minus 47.3 % → Xe-126