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This includes information on isotopes, atomic properties, molecular and bulk forms. Chemical properties and its astronomical, geological, and biological abundance will also be included. Particular individuals and groups who are expert may also be mentioned. Information about the cultural ,institutional sociological, and historical aspects of helium will also included here. |
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Helium plays a negligible role in biology.
Helium is found in only trace amounts on earth. It may be found in greater concentrations in the upper atmosphere, can be dissolved in seawater, and can be found in some deposits of natural gas. It is usually the product of radiocative decay
Helium is the second most abundant element in the universe.
Helium forms no chemical compounds under ordinary conditions. It is usually found in mixtures with other gases. Its nuclear reactions are significant. It is chemically inert. It can be liquefied at extremely low temperatures, but not solidified at ordinary pressures.
Isotopes
| Nuclear composition | Mass | Abundance | |
| 3He | 3.016029310(1) | 0.000187% | |
| 4He | 4.002603250(1) | 99.999863% |