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- Bohr_radius abstract "The Bohr radius is a physical constant, approximately equal to the most probable distance between the proton and electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. In SI units the Bohr radius is:where:is the permittivity of free spaceis the reduced Planck's constantis the electron rest massis the elementary chargeis the speed of light in vacuumis the fine structure constant.In Gaussian units the Bohr radius is simplyAccording to 2010 CODATA the Bohr radius has a value of 5.2917721092(17)×10−11 m (i.e., approximately 53 pm or 0.53 angstroms).In the Bohr model of the structure of an atom, put forward by Niels Bohr in 1913, electrons orbit a central nucleus. The model says that the electrons orbit only at certain distances from the nucleus, depending on their energy. In the simplest atom, hydrogen, a single electron orbits the nucleus and its smallest possible orbit, with lowest energy, has an orbital radius almost equal to the Bohr radius. (It is not exactly the Bohr radius due to the reduced mass effect. They differ by about 0.1%.)Although the Bohr model is no longer in use, the Bohr radius remains very useful in atomic physics calculations, due in part to its simple relationship with other fundamental constants. (This is why it is defined using the true electron mass rather than the reduced mass, as mentioned above.) For example, it is the unit of length in atomic units.According to the modern, quantum-mechanical understanding of the hydrogen atom, the average distance −its expectation value− between electron and proton is ≈1.5a0, somewhat different than the value in the Bohr model (≈a0), but certainly the same order of magnitude.The Bohr radius of the electron is one of a trio of related units of length, the other two being the Compton wavelength of the electron and the classical electron radius . The Bohr radius is built from the electron mass , Planck's constant and the electron charge . The Compton wavelength is built from , and the speed of light . The classical electron radius is built from , and . Any one of these three lengths can be written in terms of any other using the fine structure constant The Compton wavelength is about 20 times smaller than the Bohr radius, and the classical electron radius is about 1000 times smaller than the Compton wavelength.".
- Bohr_radius wikiPageExternalLink bohr_radius.
- Bohr_radius wikiPageID "174396".
- Bohr_radius wikiPageRevisionID "605281080".
- Bohr_radius above "Bohr radius".
- Bohr_radius data Niels_Bohr.
- Bohr_radius data "317.4".
- Bohr_radius data "a0".
- Bohr_radius data "≈ 0.529 Å".
- Bohr_radius data "≈ 52.9 pm".
- Bohr_radius hasPhotoCollection Bohr_radius.
- Bohr_radius label "Named after:".
- Bohr_radius label "Symbol:".
- Bohr_radius label "Value in angstroms:".
- Bohr_radius label "Value in meters:".
- Bohr_radius label "Value in picometers:".
- Bohr_radius subject Category:Atomic_physics.
- Bohr_radius subject Category:Physical_constants.
- Bohr_radius subject Category:Units_of_length.
- Bohr_radius type Abstraction100002137.
- Bohr_radius type Cognition100023271.
- Bohr_radius type Concept105835747.
- Bohr_radius type Constant105858936.
- Bohr_radius type Content105809192.
- Bohr_radius type DefiniteQuantity113576101.
- Bohr_radius type Idea105833840.
- Bohr_radius type Measure100033615.
- Bohr_radius type PhysicalConstants.
- Bohr_radius type PsychologicalFeature100023100.
- Bohr_radius type Quantity105855125.
- Bohr_radius type UnitOfMeasurement113583724.
- Bohr_radius type UnitsOfLength.
- Bohr_radius comment "The Bohr radius is a physical constant, approximately equal to the most probable distance between the proton and electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom.".
- Bohr_radius label "Bohr radius".
- Bohr_radius label "Bohrscher Radius".
- Bohr_radius label "Bohrstraal".
- Bohr_radius label "Promień atomu Bohra".
- Bohr_radius label "Radio de Bohr".
- Bohr_radius label "Raggio di Bohr".
- Bohr_radius label "Raio de Bohr".
- Bohr_radius label "Rayon de Bohr".
- Bohr_radius label "Боровский радиус".
- Bohr_radius label "نصف قطر بور".
- Bohr_radius label "ボーア半径".
- Bohr_radius label "玻尔半径".
- Bohr_radius sameAs Bohrův_poloměr.
- Bohr_radius sameAs Bohrscher_Radius.
- Bohr_radius sameAs Radio_de_Bohr.
- Bohr_radius sameAs Rayon_de_Bohr.
- Bohr_radius sameAs Raggio_di_Bohr.
- Bohr_radius sameAs ボーア半径.
- Bohr_radius sameAs 보어_반지름.
- Bohr_radius sameAs Bohrstraal.
- Bohr_radius sameAs Promień_atomu_Bohra.
- Bohr_radius sameAs Raio_de_Bohr.
- Bohr_radius sameAs m.017k78.
- Bohr_radius sameAs Q652571.
- Bohr_radius sameAs Q652571.
- Bohr_radius sameAs Bohr_radius.
- Bohr_radius wasDerivedFrom Bohr_radius?oldid=605281080.
- Bohr_radius isPrimaryTopicOf Bohr_radius.