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Helium is a commonly used carrier gas for gas chromatography. The age of rocks and minerals that contain uranium and thorium can be estimated by measuring the level of helium with a process known as helium dating. [28] [30] Helium at low temperatures is used in cryogenics and in certain cryogenic applications.
Though all heavier helium isotopes decay with a half-life of <1 second, particle accelerator collisions have been used, to create unusual nuclei of elements such as helium, lithium, and nitrogen. The unusual nuclear structures of such isotopes may offer insights into the isolated properties of neutrons and physics beyond the Standard Model. [28 ...
Helium, 2 He; Helium; Pronunciation / ˈ h iː l i ə m / (HEE-lee-əm) Appearance: colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field: Standard atomic weight A r °(He)
Helium, atom, Atomic nucleus, Atomic radius, 2 others. FP category for this image Wikipedia:Featured pictures/Diagrams, drawings, and maps/Diagrams Creator Yzmo. Support as nominator--Crisco 1492 04:44, 11 December 2011 (UTC) Comment - The red box around the insert seems unnecessary. Kaldari 06:29, 11 December 2011 (UTC)
Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K).
[18] [19] Samples of the lithium ore spodumene from Edison Mine, South Dakota were found to contain 12 parts of helium-3 to a million parts of helium-4. Samples from other mines showed 2 parts per million. [18] Helium is also present as up to 7% of some natural gas sources, [20] and large sources have over 0.5% (above 0.2% makes it viable to ...
The helium atom. Depicted are the nucleus (pink) and the electron cloud distribution (black). The nucleus (upper right) in helium-4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case. Helium-4 (4 He) is a stable isotope of the element helium.
Needpix - library of more than 1.5 million free, or so-called Public Domain Photos and Illustrations licensed with CC0. PDPics.com – Public domain photo collection with about 7400 high resolution pictures up to 6000x4000. All images licensed under CC0 license. Smithsonian Institution – Open Access – 2.8 million Free Public Domain images ...