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    Home > Biochemistry News > Biotechnology News > the same price

    the same price

    • Last Update: 2020-11-24
    • Source: Internet
    • Author: User
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    or atomic price is one of the most important concepts in chemistry, but so far there is no strict definition. There are two meanings to the commonly understood price-to-value. First, it refers to the interaction between atoms in molecules, which in this sense is the price of chemical, and later developed into the theory of chemical bonds. Second, it refers to the special properties of each atom of an element that tends to bind to a certain number of other atoms when it is combined. This property was initially called "saturation capacity" by the British chemist
    Edward Frankland (1825-1899) and later by the German chemist Friedrich August Kekulé (1829-18). 96) and Adolph Wilhelm Hermann Kolbe (1818-1884) are expressed in "atomic numbers" or "affinity units" and are considered to have a number of atoms of carbon, plus or minus. Later, the German chemist Julius Lothar Meyer (1830-1895) suggested replacing the term "atomic number" with the term "atomic price", which in the sense of co-price laid the foundation for the theory of the chemical structure of
    organic
    . Ion price is the charge that is charged by ions in ionized crystals or molecules, or in solutions or molten salts. In essence, this is the number of atomic electrons of an element, the negative value of electrons, the positive value of electrons. So it's called electricity price. In the co-
    compound
    , the number of common electron pairs formed by one atom of an element and other atoms is the co-price of the element. The co-price is positive or negative. For example, in organic compounds, the combined price of carbon is 4. In the past, there were no oxidation values in many middle school textbooks, so according to the deviation or bias of the common electronic pairs, the combined price was divided into positive or negative prices, which is essentially the concept of elemental oxidation values. Recently, some newly compiled middle school textbooks have begun to use oxidation values to analyze the essence of redox reactions and level the equations for these reactions. Oxidation values are defined as man-made (e.g. H and O are defined as 1 and -2, respectively, which is





    H

    2


    , and it is difficult to determine many compounds (e.g.
    N


    2

    O, NO, N2

    3


    ,
    HNO



    2


    ,



    2
    br br ,
    N


    2


    O 4


    ,
    N


    2
    the




    ,
    HNO 3 ) molecules in the O,
    HNO) molecule. To this end, China's famous chemist Xu Guangxian in recent years put forward a new definition of co-price, that is, an atom in the formation of molecules accepted by the effective number of shared electrons, its value is the number of bonded electrons minus the difference between the number of anti-bond electrons.



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