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The bifluoride ion has a linear, centrosymmetric structure (D ∞h symmetry), with an F−H bond length of 114 pm. [1] The bond strength is estimated to be greater than 155 kJ/mol. [2] In molecular orbital theory, the atoms are modeled to be held together by a 3-center 4-electron bond (symmetrical hydrogen bond), [3] in a sort of hybrid between a hydrogen bond and a covalent bond.
The FLOSS Manuals (FM) is a non-profit foundation founded in 2006 by Adam Hyde and based in the Netherlands. The foundation is focused on the creation of quality documentation about how to use free software. Its web site is a wiki (previously using the TWiki and Booki programs, now using Booktype) focused on the collaborative authoring of manuals.
The fluoronium ion is an inorganic cation with the chemical formula H 2 F +It is one of the cations found in fluoroantimonic acid. [1] The structure of the salt with the Sb 2 F − 11 anion, has been determined.
As the software industry was developing, the question of how to best document software programs was undecided. This was a unique problem for software developers, since users often became frustrated with current help documents. [2] Some considerations for writing a user guide that developed at this time include: the use of plain language [2]
HF2 may refer to: Factor H, a glycoprotein. Housefull 2, a 2012 Bollywood film featuring an ensemble cast. Henry Ford II - (initials include HF2) former CEO of Ford Motor Company, grandson of company founder with the same name.
The first edition of The Merck Manual was published in 1899 by Merck & Co., Inc. for physicians and pharmacists and was titled Merck's Manual of the Materia Medica. [6] [7] The 192 page book which sold for US $1.00, was divided into three sections, Part I ("Materia Medica") was an alphabetical listing of all known compounds thought to be of therapeutic value with uses and doses; Part II ...
The Britten-Norman BN-2 Islander is a British light utility aircraft and regional airliner designed and originally manufactured by Britten-Norman of the United Kingdom. Still in production, the Islander is one of the best-selling commercial aircraft types produced in Europe.
There are three major versions of HF-2 in service. The first to enter service is the ship-based HF-2, with 2 twin box launcher on destroyer DD-915 first as a trial vessel.