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  2. Degrees of freedom (physics and chemistry) - Wikipedia

    en.wikipedia.org/wiki/Degrees_of_freedom_(physics...

    In statistical mechanics, a degree of freedom is a single scalar number describing the microstate of a system. [1] The specification of all microstates of a system is a point in the system's phase space. In the 3D ideal chain model in chemistry, two angles are necessary to describe the orientation of each monomer.

  3. Monotonic function - Wikipedia

    en.wikipedia.org/wiki/Monotonic_function

    A function that is not monotonic. In mathematics, a monotonic function (or monotone function) is a function between ordered sets that preserves or reverses the given order. [ 1 ][ 2 ][ 3 ] This concept first arose in calculus, and was later generalized to the more abstract setting of order theory.

  4. Atomic, molecular, and optical physics - Wikipedia

    en.wikipedia.org/wiki/Atomic,_molecular,_and...

    v. t. e. Atomic, molecular, and optical physics (AMO) is the study of matter –matter and light –matter interactions, at the scale of one or a few atoms [ 1 ] and energy scales around several electron volts. [ 2 ]: 1356[ 3 ] The three areas are closely interrelated. AMO theory includes classical, semi-classical and quantum treatments.

  5. Molecular model - Wikipedia

    en.wikipedia.org/wiki/Molecular_model

    A molecular model is a physical model of an atomistic system that represents molecules and their processes. They play an important role in understanding chemistry and generating and testing hypotheses. The creation of mathematical models of molecular properties and behavior is referred to as molecular modeling, and their graphical depiction is ...

  6. Molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Molecular_geometry

    Molecular geometry. Appearance. Geometry of the water molecule with values for O-H bond length and for H-O-H bond angle between two bonds. Molecular geometry is the three-dimensional arrangement of the atoms that constitute a molecule. It includes the general shape of the molecule as well as bond lengths, bond angles, torsional angles and any ...

  7. Diatomic molecule - Wikipedia

    en.wikipedia.org/wiki/Diatomic_molecule

    Diatomic molecule. Diatomic molecules (from Greek di- 'two') are molecules composed of only two atoms, of the same or different chemical elements. If a diatomic molecule consists of two atoms of the same element, such as hydrogen (H2) or oxygen (O2), then it is said to be homonuclear. Otherwise, if a diatomic molecule consists of two different ...

  8. Electron density - Wikipedia

    en.wikipedia.org/wiki/Electron_density

    Electron density. Electron density or electronic density is the measure of the probability of an electron being present at an infinitesimal element of space surrounding any given point. It is a scalar quantity depending upon three spatial variables and is typically denoted as either or . The density is determined, through definition, by the ...

  9. Molecular orbital - Wikipedia

    en.wikipedia.org/wiki/Molecular_orbital

    In chemistry, a molecular orbital (/ ɒrbədl /) is a mathematical function describing the location and wave-like behavior of an electron in a molecule. This function can be used to calculate chemical and physical properties such as the probability of finding an electron in any specific region.