Atomic mass
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Last Update: 2020-11-23
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Source: Internet
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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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