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Valence (chemistry)
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Valence (chemistry)
In
chemistry
, the
valence
or
valency
of an
element
is a measure of its combining power with other atoms when it forms
chemical compounds
or
molecules
. The concept of valence was developed in the second half of the 19th century and was successful in explaining the molecular structure of inorganic and organic compounds. The quest for the underlying causes of valence led to the modern theories of chemical bonding, including the
cubical atom
(1902),
Lewis structures
(1916),
valence bond theory
(1927),
molecular orbitals
(1928),
valence shell electron pair repulsion theory
(1958), and all of the advanced methods of
quantum chemistry
.
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