K

Potassium-40

Protons (Z)

19

Neutrons (N)

21

Mass number

40

Half-Life

1.25 Gy

Abundance

0.0117%

Mass

39.964 u

Mass Excess

-33,535.5 keV

Spin

4-

Discovered

1935

Binding energy per nucleon

8,538 keV

Neutron separation energy

7,800 keV

Proton separation energy

7,582 keV

Decay Mode

Decay chain

Potassium-40Z 19 · N 211.25 Gy
β⁻89.28%