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Krypton
Isotopic Abundances of Niobium
K (Symbol of Potassium)
30 (Atomic Number of Zinc)
Curie Point of Nickel in °C

Ar

Argon

24 known isotopes (3 stable, 21 radioactive)

Show stable only

³⁰Ar

Mass

30.023694 u

Abundance

—

Half-life

10 picoseconds

Spin/Parity

0+

Decay Mode(s)

Two-proton emission (100%)

³¹Ar

Mass

31.012158 u

Abundance

—

Half-life

15.0 milliseconds

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%), β⁺p (68.3%), B+2P (8.9%)

³²Ar

Mass

31.997638 u

Abundance

—

Half-life

98 milliseconds

Spin/Parity

0+

Decay Mode(s)

EC/β⁺ (100%), ECP (35.58%)

³³Ar

Mass

32.989926 u

Abundance

—

Half-life

173.0 milliseconds

Spin/Parity

1/2+

Decay Mode(s)

EC/β⁺ (100%), ECP (38.7%)

³⁴Ar

Mass

33.980270 u

Abundance

—

Half-life

843.8 milliseconds

Spin/Parity

0+

Decay Mode(s)

EC/β⁺ (100%)

³⁵Ar

Mass

34.975258 u

Abundance

—

Half-life

1.7756 seconds

Spin/Parity

3/2+

Decay Mode(s)

EC/β⁺ (100%)

³⁶Ar Stable

Mass

35.967545 u

Abundance

0.3336%

Half-life

Stable

Spin/Parity

0+

Decay Mode(s)

—

³⁷Ar

Mass

36.966776 u

Abundance

—

Half-life

35.011 d

Spin/Parity

3/2+

Decay Mode(s)

Electron capture (100%)

³⁸Ar Stable

Mass

37.962732 u

Abundance

0.0629%

Half-life

Stable

Spin/Parity

0+

Decay Mode(s)

—

³⁹Ar

Mass

38.964313 u

Abundance

—

Half-life

268 years

Spin/Parity

7/2-

Decay Mode(s)

β⁻ (100%)

⁴⁰Ar Stable

Mass

39.962383 u

Abundance

99.6035%

Half-life

Stable

Spin/Parity

0+

Decay Mode(s)

—

⁴¹Ar

Mass

40.964501 u

Abundance

—

Half-life

109.61 m

Spin/Parity

7/2-

Decay Mode(s)

β⁻ (100%)

⁴²Ar

Mass

41.963046 u

Abundance

—

Half-life

32.9 years

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

⁴³Ar

Mass

42.965636 u

Abundance

—

Half-life

5.37 m

Spin/Parity

5/2(-)

Decay Mode(s)

β⁻ (100%)

⁴⁴Ar

Mass

43.964924 u

Abundance

—

Half-life

11.87 m

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

⁴⁵Ar

Mass

44.968040 u

Abundance

—

Half-life

21.48 seconds

Spin/Parity

5/2- 7/2-

Decay Mode(s)

β⁻ (100%)

⁴⁶Ar

Mass

45.968039 u

Abundance

—

Half-life

8.4 seconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

⁴⁷Ar

Mass

46.972767 u

Abundance

—

Half-life

1.23 seconds

Spin/Parity

(3/2)-

Decay Mode(s)

β⁻ (100%), β⁻n (0.2%)

⁴⁸Ar

Mass

47.976001 u

Abundance

—

Half-life

416 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%), β⁻n (38%)

⁴⁹Ar

Mass

48.981685 u

Abundance

—

Half-life

170 milliseconds

Spin/Parity

—

Decay Mode(s)

β⁻ (100%), β⁻n (65%)

⁵⁰Ar

Mass

49.985797 u

Abundance

—

Half-life

106 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%), β⁻n (37%)

⁵¹Ar

Mass

50.993033 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

⁵²Ar

Mass

51.998519 u

Abundance

—

Half-life

Unknown

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

⁵³Ar

Mass

53.007290 u

Abundance

—

Half-life

620 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

Decay mode abbreviations:

β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay

n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition

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Name

Atomic Mass

Series

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Nonmetals