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- Bismuth
- Gas Phase of Palladium
- Np (Symbol of Neptunium)
- 72 (Atomic Number of Hafnium)
- Discovered of Samarium in s
He
Helium
8 known isotopes (2 stable,
6 radioactive)
3He Stable
Mass
3.016029 u
Abundance 0.0200%
Half-life Stable
Spin/Parity 1/2+
Decay Mode(s) —
4He Stable
Mass
4.002603 u
Abundance 99.9998%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
5He
Mass
5.012057 u
Abundance —
Half-life 0.648 MeV (resonance width)
Spin/Parity 3/2-
Decay Mode(s) Unknown
6He
Mass
6.018886 u
Abundance —
Half-life 806.7 milliseconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
7He
Mass
7.027991 u
Abundance —
Half-life 150 keV (resonance width)
Spin/Parity (3/2)-
Decay Mode(s) Unknown
8He
Mass
8.033934 u
Abundance —
Half-life 119.1 milliseconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%), β⁻n (16%)
9He
Mass
9.043946 u
Abundance —
Half-life Unknown
Spin/Parity 1/2+
Decay Mode(s) Neutron emission (100%)
10He
Mass
10.052815 u
Abundance —
Half-life 300 keV (resonance width)
Spin/Parity (0+)
Decay Mode(s) Neutron emission (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
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