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    Home > Biochemistry News > Biotechnology News > Atomic mass

    Atomic mass

    • Last Update: 2020-11-23
    • Source: Internet
    • Author: User
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    the mass of an atom of each nuclein is called the atomic mass of that nuclein.
    atom is very small, so its mass is very small. For example, the mass of the nuclose
    35Cl
    is
    5.80672
    ×
    10
    -26
    kg
    , so small numbers are inconvenient to write, remember and use. The International Bureau of Metrology stipulates that 1/12
    of the atomic mass of a

    12
    C
    nuclein is a unit of atomic mass (
    atomic mass unit
    ), with the symbol
    u
    .
    1u s 1.6605402
    ×
    10
    -27
    kg
    .
    atomic mass units are used to represent the atomic mass of a nucleus, aThe atomic mass
    12
    c is equal to 12
    u
    , and the atomic mass of 35
    cl
    is equal to
    34.96885u
    , the atomic mass of 37
    Cl
    is equal to
    36.96590u
    .
    the product of the atomic mass and abundance of various nucleins of an element, called the average atomic mass of this element. For example, chlorine has two types of
    isotopes
    :
    35Cl
    with a abundance of
    75.77
    % and
    37Cl
    with a abundance of
    24.23
    %.
    The
    atomic mass of Cl
    is 34.96885u
    ×
    75.77
    % 36.96590u
    ×
    24.23
    %

    35.453u Ar(
    Cl
    )
    -35.453Visible, a different nuclon of an element, the value of atomic mass is different; Atomic mass and average atomic mass have units (
    kg
    or

    ), while there are no units relative to atomic mass.
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