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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 ...
2 ion is formed with bond order 1/2. Another molecule that is precluded based on this principle is diberyllium. Beryllium has an electron configuration 1s 2 2s 2, so there are again two electrons in the valence level. However, the 2s can mix with the 2p orbitals in diberyllium, whereas there are no p orbitals in the valence level of hydrogen or ...
Beryllium(II) forms many complexes with bidentate ligands containing oxygen-donor atoms. [51] The species [Be 3 O(H 2 PO 4) 6] 2-is notable for having a 3-coordinate oxide ion at its center. Basic beryllium acetate, Be 4 O(OAc) 6, has an oxide ion surrounded by a tetrahedron of beryllium atoms.
A beryllium ion has been trapped in a superposed state. [4] A double slit experiment has been performed with molecules as large as buckyballs and functionalized oligoporphyrins with up to 2000 atoms. [5] [6] Molecules with masses exceeding 10,000 and composed of over 810 atoms have successfully been superposed [7]
Beryllium sulfide powders can be prepared by the reaction of sulfur and beryllium in a hydrogen atmosphere by heating the mixture for 10-20 minutes at temperatures from 1000-1300 °C. If done at 900 °C, there is beryllium metal impurities. [4] Alternatively, it can be prepared by the reaction of beryllium chloride and hydrogen sulfide at 900 ...
Beryllium nitride, Be 3 N 2, is a nitride of beryllium. It can be prepared from the elements at high temperature (1100–1500 °C); [2] unlike beryllium azide or BeN 6, it decomposes in vacuum into beryllium and nitrogen. [2] It is readily hydrolysed forming beryllium hydroxide and ammonia. [2]
Beryllium fluoride has distinctive optical properties. In the form of fluoroberyllate glass, it has the lowest refractive index for a solid at room temperature of 1.275. Its dispersive power is the lowest for a solid at 0.0093, and the nonlinear coefficient is also the lowest at 2 × 10 −14.
The reaction with lithium hydride (in which the hydride ion is the Lewis base), forms sequentially LiBeH 3 and Li 2 BeH 4. [3] The latter contains the tetrahydridoberyllate(2-) anion BeH 2− 4. Beryllium hydride reacts with trimethylamine, N(CH 3) 3 to form a dimeric adduct with bridging hydrides. [11]