Periodic Table of Elements
He - Helium
Helium Menu
- Helium Page One
- Helium Page Two
Nuclides / Isotopes
| Nuc- lide | Atomic Mass | NN | Abun % | Spin | Half Life | DM | DT | BR % | Decay Energy (MeV) |
|---|---|---|---|---|---|---|---|---|---|
| He3 | 3.016 | 1 | Syn | 1/2+ | Stable | ||||
| He4 | 4.0026 | 2 | 100. | 0+ | Stable | ||||
| He5 | 5.0122 | 3 | Syn | 3/2- |  | N1 | 0.890 | ||
| N | He4 | 0.890 | |||||||
| He6 | 6.0189 | 4 | Syn | 0+ | 806.7ms |  - | Li6 | 3.508 | |
| He7 | 7.028 | 5 | Syn | 3/2- | N | He6 | 0.440 | ||
| He8 | 8.0339 | 6 | Syn | 0+ | 119ms | - + N | Li7 | 16 | 8.619 |
| 119ms | - | Li8 | 10.653 | ||||||
| He9 | 9.0438 | 7 | Syn | 1/2- | N | He8 | 1.150 | ||
| He10 | 10.0524 | 8 | Syn | 0+ | N | He9 | |||
| Nuclide | Potential Parent Nuclides |
|---|---|
| He3 | H3 (Syn) Li4 (Syn) |
| He4 | Be6 (Syn) B8 (Syn) He5 (Syn) Li5 (Syn) |
| He5 | None known |
| He6 | He7 (Syn) |
| He7 | None known |
| He8 | He9 (Syn) |
| He9 | He10 (Syn) |
| He10 | None known |
Key:
| |
= Electron CaptureHelium Menu
- Helium Page One
- Helium Page Two
Related Resources
- Anatomy of the Atom
Answers many questions regarding the structure of atoms. - Molarity, Molality and Normality
Introduces stoichiometry and explains the differences between molarity, molality and normality. - Molar Mass Calculations and Javascript Calculator
Molar mass calculations are explained and there is a JavaScript calculator to aid calculations. - Chemical Database
This database focuses on the most common chemical compounds used in the home and industry.
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