Ar

Argon-39

Protons (Z)

18

Neutrons (N)

21

Mass number

39

Half-Life

268.0 y

Abundance

---

Mass

38.964 u

Mass Excess

-33,242.0 keV

Spin

7/2-

Discovered

1950

Binding energy per nucleon

8,563 keV

Neutron separation energy

6,598 keV

Proton separation energy

10,733 keV

Decay Mode

β⁻Potassium-39100%

Decay chain

Argon-39Z 18 · N 21268.0 y
β⁻100%