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Beryllium-10 has a half-life of 1.39 × 10 6 y, and decays by beta decay to stable boron-10 with a maximum energy of 556.2 keV. [ 7 ] [ 8 ] It is formed in the Earth's atmosphere mainly by cosmic ray spallation of nitrogen and oxygen.
2 He + 6 2 He, 6 2 He → 6 3 Li + β −, 6 3 Li + n → 4 2 He + 3 1 H. 6 2 He has a half-life of only 0.8 seconds, β − is an electron, and 6 3 Li has a high neutron absorption cross section. Tritium is a radioisotope of concern in nuclear reactor waste streams. [20]
The authors also argue that due to the immense size of the universe, even if another habitable planet like Earth does exist elsewhere, meaning that the Earth is not the only planet in the universe with complex life, such planets would still only appear in relatively small numbers compared to planets that are habitable only to bacteria. Such ...
Unlike the other group 2 metals, beryllium does not react with hydrogen. [3] Instead, BeH 2 is prepared from preformed beryllium(II) compounds. It was first synthesized in 1951 by treating dimethylberyllium, Be(CH 3) 2, with lithium aluminium hydride, LiAlH 4. [4] Purer BeH 2 forms from the pyrolysis of di-tert-butylberyllium, Be(C[CH 3] 3) 2 ...
Habitable zone for complex life (HZCL): the place that all the life habitable zones overlap for a long period of time, as in the Solar System. [90] The list of habitable zones for complex life has grown longer with increasing understanding of the Universe, galaxies, and the Solar System.
He poses the question whether in the times of ultimate expansion of the Universe with extremely low density of matter some structures could exist that can support the life of the entities he calls the "Diffuse Ones". He also discussed the possibility of life without sunlight/starlight, e.g., on the surface of brown dwarfs.
The Rare Earth hypothesis argues that planets with complex life, like Earth, are exceptionally rare.. In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical ...
Beryllium iodide is an inorganic compound with the chemical formula Be I 2. It is a hygroscopic white solid. The Be 2+ cation, which is relevant to salt-like BeI 2, is characterized by the highest known charge density (Z/r = 6.45), making it one of the hardest cations and a very strong Lewis acid. [4]