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  2. Beryllium - Wikipedia

    en.wikipedia.org/wiki/Beryllium

    Beryllium ore with a U.S. penny for scale Emerald is a naturally occurring compound of beryllium. The Sun has a concentration of 0.1 parts per billion (ppb) of beryllium. [34] Beryllium has a concentration of 2 to 6 parts per million (ppm) in the Earth's crust and is the 47th most abundant element. [35] [36] It is most concentrated in the soils ...

  3. Linear molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Linear_molecular_geometry

    Structure of beryllium fluoride (BeF 2), a compound with a linear geometry at the beryllium atom.. The linear molecular geometry describes the geometry around a central atom bonded to two other atoms (or ligands) placed at a bond angle of 180°.

  4. Modulated neutron initiator - Wikipedia

    en.wikipedia.org/wiki/Modulated_neutron_initiator

    The initiator used in the early devices, located at the center of the bomb's plutonium pit, consisted of a beryllium pellet and a beryllium shell with polonium between the two. The pellet, 0.8 cm in diameter, was coated with nickel and then a layer of gold. The beryllium shell was of 2 cm outer diameter with wall thickness of 0.6 cm.

  5. Tetrafluoroberyllate - Wikipedia

    en.wikipedia.org/wiki/Tetrafluoroberyllate

    The Be–F bond length is between 145 and 153 pm.The beryllium is sp 3 hybridized, leading to a longer bond than in BeF 2, where beryllium is sp hybridized. [11] In trifluoroberyllates, there are actually BeF 4 tetrahedra arranged in a triangle, so that three fluorine atoms are shared on two tetrahedra each, resulting in a formula of Be 3 F 9.

  6. Oganesson - Wikipedia

    en.wikipedia.org/wiki/Oganesson

    In a quantum-tunneling model, the alpha decay half-life of 294 Og was predicted to be 0.66 +0.23 −0.18 ms [112] with the experimental Q-value published in 2004. [119] Calculation with theoretical Q-values from the macroscopic-microscopic model of Muntian–Hofman–Patyk–Sobiczewski gives somewhat lower but comparable results. [120]

  7. Isotopes of beryllium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_beryllium

    Beryllium is unique as being the only monoisotopic element with both an even number of protons and an odd number of neutrons. There are 25 other monoisotopic elements but all have odd atomic numbers, and even numbers of neutrons. Of the 10 radioisotopes of beryllium, the most stable are 10 Be with a half-life of 1.387(12) million years [nb 1 ...

  8. Beryllium-10 - Wikipedia

    en.wikipedia.org/wiki/Beryllium-10

    Beryllium-10 (10 Be) is a radioactive isotope of beryllium. It is formed in the Earth's atmosphere mainly by cosmic ray spallation of nitrogen and oxygen. [ 3 ] [ 4 ] [ 5 ] Beryllium-10 has a half-life of 1.39 × 10 6 years, [ 6 ] [ 7 ] and decays by beta decay to stable boron-10 with a maximum energy of 556.2 keV.

  9. Organoberyllium chemistry - Wikipedia

    en.wikipedia.org/wiki/Organoberyllium_chemistry

    Organoberyllium chemistry involves the synthesis and properties of organometallic compounds featuring the group 2 alkaline earth metal beryllium (Be). [2] The area remains less developed relative to the chemistry of other main-group elements , because Be compounds are toxic and few applications have been found.