What is molecule?


A molecule ( /ˈmɒlɪkjuːl/) is an electrically neutral group of two or more atoms held together by covalent chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term molecule is often used less strictly, also being applied to polyatomic ions.

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Some articles on molecule:

Coelenterazine - Properties
... The molecule absorbs light in the ultraviolet and visible spectrum, with peak absorption at 435 nm in methanol, giving the molecule a yellow color ... The molecule spontaneously oxidizes in aerobic conditions or in some organic solvents such as dimethylformamide and DMSO and is preferentially stored in methanol or with ...
Molecule - Theoretical Aspects
... The study of molecules by molecular physics and theoretical chemistry is largely based on quantum mechanics and is essential for the understanding of the chemical bond ... The simplest of molecules is the hydrogen molecule-ion, H2+, and the simplest of all the chemical bonds is the one-electron bond ... of fast digital computers, approximate solutions for more complicated molecules became possible and are one of the main aspects of computational chemistry ...
Langmuir Adsorption Model - Entropic Considerations
... To find the entropy decrease, we find the entropy of the molecule when in the adsorbed condition Using Stirling's approximation, we have, On the other hand, the entropy of a ...
... The molecule is most commonly used as in biochemistry and cell biology laboratories as a selective inhibitor of the proteasome ... The molecule is a lactam, or cyclic amide ... A number of syntheses of this molecule have been published and there are no less than 1,300 references to this natural product in the literature ...
Linear Dichroism - Basic Information
... possible to measure how much more energy is absorbed in one dimension of the molecule relative to the other, providing information to the experimentalist ... As light interacts with the molecule being investigated, should the molecule start absorbing the light then electron density inside the molecule will be shifted as the ... The LD of an oriented molecule can be calculated using the following equation- For most chemical systems this represents an electric transition polarised across the length of the molecule (i.e ...

More definitions of "molecule":

  • (noun): (physics and chemistry) the simplest structural unit of an element or compound.

Famous quotes containing the word molecule:

    We can come up with a working definition of life, which is what we did for the Viking mission to Mars. We said we could think in terms of a large molecule made up of carbon compounds that can replicate, or make copies of itself, and metabolize food and energy. So that’s the thought: macrocolecule, metabolism, replication.
    Cyril Ponnamperuma (b. 1923)