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From a cross-project redirect: This is a redirect from a title linked to an item on Wikidata.The Wikidata item linked to this page is helium-10 (Q12624964).. Use this template only on hard redirects – for soft redirects use {{Soft redirect with Wikidata item}}.
10 −24 seconds hydrogen-5: 86(6) lithium-4: 91(9) hydrogen-4: 139(10) nitrogen-10: 143(36) oxygen-11: 198(12) helium-10: 260(40) hydrogen-6: 294(67) lithium-5: 370(30) fluorine-14: 500(60) boron-7: 570(14) nitrogen-11: 585(7) helium-5: 602(22) beryllium-16: 650(130) hydrogen-7: 652(558) nitrogen-11m: 690(80) boron-21 > 760: neon-15: 770(300 ...
The least stable is 10 He, with half-life 260(40) yoctoseconds (2.6(4) × 10 −22 s), though 2 He may have an even shorter half-life. In Earth's atmosphere, the ratio of 3 He to 4 He is 1.343(13) × 10 −6. [5] However, the isotopic abundance of helium varies greatly depending on its origin.
Airlander 10 in Hangar One at Cardington Airfield, January 2016. The HAV 304 / Airlander 10 is a hybrid airship, achieving lift, and thereby flight, via both aerostatic and aerodynamic forces. Unlike most airship designs, it does not have a circular cross-section, having adopted an elliptical shape with a contoured and flattened hull.
The known doubly magic isotopes are helium-4, helium-10, oxygen-16, calcium-40, calcium-48, nickel-48, nickel-56, nickel-78, tin-100, tin-132, and lead-208. While only helium-4, oxygen-16, calcium-40, and lead-208 are completely stable, calcium-48 is extremely long-lived and therefore found naturally, disintegrating only by a very inefficient ...
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Helium is the smallest and the lightest noble gas and one of the most unreactive elements, so it was commonly considered that helium compounds cannot exist at all, or at least under normal conditions. [1] Helium's first ionization energy of 24.57 eV is the highest of any element. [2]
The Ethiopian government used money from a World Bank-financed health and education initiative to brutally evict thousands of villagers , according to former government officials who helped carry out the forced removals. The World Bank, the planet's most influential development lender, has denied responsibility.
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