Periodic Table/Potassium/⁴⁰K

← 39K41K →

⁴⁰K

Potassium-40

Radioactive· Half-life: 1.25 Gy

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

19

Neutrons (N)

21

Mass Number (A)

40

Atomic Mass

39.963998AMU

Spin / Parity

4-

Binding E/A

8.295keV

Natural Abundance

1.1700%

Half-life

1.25 Gy

Decay Modesoverview · half-life · α · β⁻ · β⁺

β⁻

89.3%

β⁺

10.7%

Decay Chain

⁴⁰KPotassium1.25 Gy

β⁻89.3%

β⁺⁴⁰Ar10.7%

⁴⁰CaCalciumSTABLE

2-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Potassium

31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

← Back to PotassiumData: IAEA NDS · ENSDF