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Cadmium
Allotropes of Nickel
Fr (Symbol of Francium)
80 (Atomic Number of Mercury)
Lifetime of Copernicium in day

Am

Americium

20 known isotopes (0 stable, 20 radioactive)

Show stable only

²²³Am

Mass

223.045840 u

Abundance

—

Half-life

5 milliseconds

Spin/Parity

—

Decay Mode(s)

α (100%)

²²⁹Am

Mass

229.045283 u

Abundance

—

Half-life

0.9 seconds

Spin/Parity

—

Decay Mode(s)

α (91%), EC/β⁺ (9%)

²³⁰Am

Mass

230.046025 u

Abundance

—

Half-life

31 seconds

Spin/Parity

—

Decay Mode(s)

Electron capture (100%)

²³²Am

Mass

232.046613 u

Abundance

—

Half-life

79 seconds

Spin/Parity

—

Decay Mode(s)

Electron capture (97%), α (3%), ECSF (0.069%)

²³³Am

Mass

233.046468 u

Abundance

—

Half-life

3.2 m

Spin/Parity

—

Decay Mode(s)

EC/β⁺ (95.5%), α (4.5%)

²³⁴Am

Mass

234.047731 u

Abundance

—

Half-life

2.32 m

Spin/Parity

—

Decay Mode(s)

Electron capture (100%)

²³⁵Am

Mass

235.047906 u

Abundance

—

Half-life

10.3 m

Spin/Parity

5/2-

Decay Mode(s)

Electron capture (99.6%), α (0.4%)

²³⁶Am

Mass

236.049427 u

Abundance

—

Half-life

3.6 m

Spin/Parity

5-

Decay Mode(s)

Electron capture (100%), α (0.004%)

²³⁷Am

Mass

237.049995 u

Abundance

—

Half-life

73.6 m

Spin/Parity

5/2(-)

Decay Mode(s)

EC/β⁺ (99.975%), α (0.025%)

²³⁸Am

Mass

238.051983 u

Abundance

—

Half-life

98 m

Spin/Parity

1+

Decay Mode(s)

EC/β⁺ (100%), α (0.0001%)

²³⁹Am

Mass

239.053023 u

Abundance

—

Half-life

11.9 h

Spin/Parity

(5/2)-

Decay Mode(s)

Electron capture (99.99%), α (0.01%)

²⁴⁰Am

Mass

240.055298 u

Abundance

—

Half-life

50.8 h

Spin/Parity

(3-)

Decay Mode(s)

Electron capture (100%), α (0.00019%)

²⁴¹Am

Mass

241.056827 u

Abundance

—

Half-life

432.6 years

Spin/Parity

5/2-

Decay Mode(s)

α (100%), Spontaneous fission (3.6e-10%)

²⁴²Am

Mass

242.059547 u

Abundance

—

Half-life

16.01 h

Spin/Parity

1-

Decay Mode(s)

β⁻ (83%), Electron capture (17%), α (0.0001%)

²⁴³Am

Mass

243.061380 u

Abundance

—

Half-life

7364 years

Spin/Parity

5/2-

Decay Mode(s)

α (100%), Spontaneous fission (3.7e-9%)

²⁴⁴Am

Mass

244.064283 u

Abundance

—

Half-life

10.1 h

Spin/Parity

(6-)

Decay Mode(s)

β⁻ (100%)

²⁴⁵Am

Mass

245.066453 u

Abundance

—

Half-life

2.05 h

Spin/Parity

(5/2)+

Decay Mode(s)

β⁻ (100%)

²⁴⁶Am

Mass

246.069774 u

Abundance

—

Half-life

39 m

Spin/Parity

(7-)

Decay Mode(s)

β⁻ (100%)

²⁴⁷Am

Mass

247.072092 u

Abundance

—

Half-life

23.0 m

Spin/Parity

(5/2)

Decay Mode(s)

β⁻ (100%)

²⁴⁸Am

Mass

248.075752 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

Conversions Print

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Sy

Name

Atomic Mass

Series

Metals

Nonmetals