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  2. Valence electron - Wikipedia

    en.wikipedia.org/wiki/Valence_electron

    In chemistry and physics, valence electrons are electrons in the outermost shell of an atom, and that can participate in the formation of a chemical bond if the outermost shell is not closed. In a single covalent bond, a shared pair forms with both atoms in the bond each contributing one valence electron. The presence of valence electrons can ...

  3. Valence (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Valence_(chemistry)

    Valence in chemistry refers to the combining power of an element, particularly its ability to form bonds with other atoms.

  4. Bed skirt - Wikipedia

    en.wikipedia.org/wiki/Bed_skirt

    Modern beds with valances. A bed skirt, sometimes spelled bedskirt, a bed ruffle, a dust ruffle in North America, a valance, [1] or a valance sheet in the British Isles, is a piece of decorative fabric that is placed between the mattress and the box spring of a bed that extends to the floor around the sides. In addition to its aesthetics, a bed ...

  5. Free electron model - Wikipedia

    en.wikipedia.org/wiki/Free_electron_model

    For the model of a free electron gas, see Fermi gas. In solid-state physics, the free electron model is a quantum mechanical model for the behaviour of charge carriers in a metallic solid. It was developed in 1927, [1] principally by Arnold Sommerfeld, who combined the classical Drude model with quantum mechanical Fermi–Dirac statistics and ...

  6. Valence and conduction bands - Wikipedia

    en.wikipedia.org/wiki/Valence_and_conduction_bands

    In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states. On a graph of ...

  7. Bond valence method - Wikipedia

    en.wikipedia.org/wiki/Bond_valence_method

    Bond valence method. The bond valence method or mean method (or bond valence sum) (not to be mistaken for the valence bond theory in quantum chemistry) is a popular method in coordination chemistry to estimate the oxidation states of atoms. It is derived from the bond valence model, which is a simple yet robust model for validating chemical ...

  8. Valence bond theory - Wikipedia

    en.wikipedia.org/wiki/Valence_bond_theory

    In chemistry, valence bond (VB) theory is one of the two basic theories, along with molecular orbital (MO) theory, that were developed to use the methods of quantum mechanics to explain chemical bonding. It focuses on how the atomic orbitals of the dissociated atoms combine to give individual chemical bonds when a molecule is formed.

  9. Valency (linguistics) - Wikipedia

    en.wikipedia.org/wiki/Valency_(linguistics)

    v. t. e. In linguistics, valency or valence is the number and type of arguments and complements controlled by a predicate, content verbs being typical predicates. Valency is related, though not identical, to subcategorization and transitivity, which count only object arguments – valency counts all arguments, including the subject.

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