Ar

Argon-40

Protons (Z)

18

Neutrons (N)

22

Mass number

40

Half-Life

Stable

Abundance

99.6035%

Mass

39.962 u

Mass Excess

-35,039.9 keV

Spin

0+

Discovered

1920

Binding energy per nucleon

8,595 keV

Neutron separation energy

9,869 keV

Proton separation energy

12,529 keV

Decay Mode

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