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Promethium
Molar Volume of Chlorine
La (Symbol of Lanthanum)
73 (Atomic Number of Tantalum)
Speed Of Sound of Flerovium in ft/s

Mg

Magnesium

23 known isotopes (3 stable, 20 radioactive)

Show stable only

¹⁸Mg

Mass

— u

Abundance

—

Half-life

0.12 MeV (resonance width)

Spin/Parity

0+

Decay Mode(s)

Two-proton emission (100%)

¹⁹Mg

Mass

19.034180 u

Abundance

—

Half-life

1.14E-4 eV (resonance width)

Spin/Parity

1/2-

Decay Mode(s)

Two-proton emission (100%)

²⁰Mg

Mass

20.018763 u

Abundance

—

Half-life

90.4 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁺ (100%), β⁺p (30.3%)

²¹Mg

Mass

21.011706 u

Abundance

—

Half-life

122 milliseconds

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%), β⁺p (32.6%), β⁺α (0.5%)

²²Mg

Mass

21.999571 u

Abundance

—

Half-life

3.8755 seconds

Spin/Parity

0+

Decay Mode(s)

EC/β⁺ (100%)

²³Mg

Mass

22.994124 u

Abundance

—

Half-life

11.3046 seconds

Spin/Parity

3/2+

Decay Mode(s)

EC/β⁺ (100%)

²⁴Mg Stable

Mass

23.985042 u

Abundance

78.9650%

Half-life

Stable

Spin/Parity

0+

Decay Mode(s)

—

²⁵Mg Stable

Mass

24.985837 u

Abundance

10.0110%

Half-life

Stable

Spin/Parity

5/2+

Decay Mode(s)

—

²⁶Mg Stable

Mass

25.982593 u

Abundance

11.0250%

Half-life

Stable

Spin/Parity

0+

Decay Mode(s)

—

²⁷Mg

Mass

26.984341 u

Abundance

—

Half-life

9.458 m

Spin/Parity

1/2+

Decay Mode(s)

β⁻ (100%)

²⁸Mg

Mass

27.983875 u

Abundance

—

Half-life

20.915 h

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

²⁹Mg

Mass

28.988607 u

Abundance

—

Half-life

1.30 seconds

Spin/Parity

3/2+

Decay Mode(s)

β⁻ (100%)

³⁰Mg

Mass

29.990465 u

Abundance

—

Half-life

335 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

³¹Mg

Mass

30.996648 u

Abundance

—

Half-life

270 milliseconds

Spin/Parity

1/2+

Decay Mode(s)

β⁻ (100%), β⁻n (6.2%)

³²Mg

Mass

31.999110 u

Abundance

—

Half-life

86 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%), β⁻n (5.5%)

³³Mg

Mass

33.005328 u

Abundance

—

Half-life

90.5 milliseconds

Spin/Parity

3/2-

Decay Mode(s)

β⁻ (100%), β⁻n (14%)

³⁴Mg

Mass

34.008935 u

Abundance

—

Half-life

20 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

³⁵Mg

Mass

35.016790 u

Abundance

—

Half-life

11.3 milliseconds

Spin/Parity

(3/2- 5/2-)

Decay Mode(s)

β⁻ (100%), β⁻n (52%)

³⁶Mg

Mass

36.021879 u

Abundance

—

Half-life

7.6 milliseconds

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

³⁷Mg

Mass

37.030286 u

Abundance

—

Half-life

8 milliseconds

Spin/Parity

—

Decay Mode(s)

Unknown

³⁸Mg

Mass

38.036580 u

Abundance

—

Half-life

Unknown

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

³⁹Mg

Mass

39.045921 u

Abundance

—

Half-life

180 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

⁴⁰Mg

Mass

40.053194 u

Abundance

—

Half-life

Unknown

Spin/Parity

0+

Decay Mode(s)

β⁻ (100%)

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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Name

Atomic Mass

Series

Metals

Nonmetals