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Holmium
Crystal Structure of Tantalum
Ba (Symbol of Barium)
116 (Atomic Number of Livermorium)
Ionization Energies of Livermorium in J/mol

U

Uranium

Properties

Isotopes

Electrons

40 known isotopes (0 stable, 40 radioactive)

Show stable only

²¹⁴U

Mass

— u

Abundance

—

Half-life

0.52 milliseconds

Spin/Parity

Decay Mode(s)

α (100%)

²¹⁵U

Mass

215.026720 u

Abundance

—

Half-life

0.7 milliseconds

Spin/Parity

—

Decay Mode(s)

α (0%)

²¹⁶U

Mass

216.024763 u

Abundance

—

Half-life

4.5 milliseconds

Spin/Parity

Decay Mode(s)

α (100%)

²¹⁷U

Mass

217.024660 u

Abundance

—

Half-life

16 milliseconds

Spin/Parity

—

Decay Mode(s)

α (100%)

²¹⁸U

Mass

218.023505 u

Abundance

—

Half-life

0.65 milliseconds

Spin/Parity

Decay Mode(s)

α (100%)

²¹⁹U

Mass

219.025009 u

Abundance

—

Half-life

60 microseconds

Spin/Parity

—

Decay Mode(s)

α (100%)

²²¹U

Mass

221.026323 u

Abundance

—

Half-life

0.66 microseconds

Spin/Parity

(9/2+)

Decay Mode(s)

α (100%)

²²²U

Mass

222.026058 u

Abundance

—

Half-life

4.7 microseconds

Spin/Parity

Decay Mode(s)

α (100%)

²²³U

Mass

223.027961 u

Abundance

—

Half-life

18 microseconds

Spin/Parity

—

Decay Mode(s)

α (100%), EC/β⁺ (0.2%)

²²⁴U

Mass

224.027636 u

Abundance

—

Half-life

396 microseconds

Spin/Parity

Decay Mode(s)

α (100%)

²²⁵U

Mass

225.029385 u

Abundance

—

Half-life

69 milliseconds

Spin/Parity

—

Decay Mode(s)

α (100%)

²²⁶U

Mass

226.029339 u

Abundance

—

Half-life

268 milliseconds

Spin/Parity

Decay Mode(s)

α (100%)

²²⁷U

Mass

227.031181 u

Abundance

—

Half-life

1.1 m

Spin/Parity

(3/2+)

Decay Mode(s)

α (100%)

²²⁸U

Mass

228.031369 u

Abundance

—

Half-life

9.1 m

Spin/Parity

Decay Mode(s)

α (95%), Electron capture (5%)

²²⁹U

Mass

229.033506 u

Abundance

—

Half-life

58 m

Spin/Parity

(3/2+)

Decay Mode(s)

Electron capture (80%), α (20%)

²³⁰U

Mass

230.033940 u

Abundance

—

Half-life

20.23 d

Spin/Parity

Decay Mode(s)

α (100%), {+22}Ne (4.8e-12%)

²³¹U

Mass

231.036292 u

Abundance

—

Half-life

4.2 d

Spin/Parity

(5/2-)

Decay Mode(s)

Electron capture (100%), α (0.004%)

²³²U

Mass

232.037155 u

Abundance

—

Half-life

68.9 years

Spin/Parity

Decay Mode(s)

α (100%), {+24}Ne (8.9e-10%), Spontaneous fission (2.7e-12%)

²³³U

Mass

233.039634 u

Abundance

—

Half-life

1.5919E5 years

Spin/Parity

5/2+

Decay Mode(s)

α (100%), 24NE (7.2e-11%), Spontaneous fission (6e-11%)

²³⁴U

Mass

234.040950 u

Abundance

0.5400%

Half-life

2.455E+5 years

Spin/Parity

Decay Mode(s)

α (100%), Spontaneous fission (1.64e-9%), Mg (1.4e-11%)

²³⁵U

Mass

235.043928 u

Abundance

0.7204%

Half-life

7.04E+8 years

Spin/Parity

7/2-

Decay Mode(s)

α (100%), Spontaneous fission (7e-9%), {+25}Ne (8e-10%)

²³⁶U

Mass

236.045566 u

Abundance

—

Half-life

2.342E7 years

Spin/Parity

Decay Mode(s)

α (100%), Spontaneous fission (9.4e-8%)

²³⁷U

Mass

237.048728 u

Abundance

—

Half-life

6.752 d

Spin/Parity

1/2+

Decay Mode(s)

β⁻ (100%)

²³⁸U

Mass

238.050787 u

Abundance

99.2742%

Half-life

4.468E9 years

Spin/Parity

Decay Mode(s)

α (100%), Spontaneous fission (0.0000545%)

²³⁹U

Mass

239.054292 u

Abundance

—

Half-life

23.45 m

Spin/Parity

5/2+

Decay Mode(s)

β⁻ (100%)

²⁴⁰U

Mass

240.056592 u

Abundance

—

Half-life

14.1 h

Spin/Parity

Decay Mode(s)

β⁻ (100%)

²⁴¹U

Mass

241.060330 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁴²U

Mass

242.062931 u

Abundance

—

Half-life

16.8 m

Spin/Parity

Decay Mode(s)

β⁻ (100%)

²⁴³U

Mass

243.067075 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁴⁴U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

Decay Mode(s)

Unknown

²⁴⁵U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁴⁶U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

Decay Mode(s)

Unknown

²⁴⁷U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁴⁸U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

Decay Mode(s)

Unknown

²⁴⁹U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁵⁰U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

Decay Mode(s)

Unknown

²⁵¹U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁵³U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

²⁵⁴U

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

Decay Mode(s)

β⁻ (100%)

²⁵⁵U

Mass

— u

Abundance

—

Half-life

Unknown

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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