Bohr Magneton
Bohr Magneton - Related Videos
02:18
The Bohr Model
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2020
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the nucleus...
08:19
The Evans Method
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University While most organic molecules are diamagnetic, wherein all their electrons are paired up in bonds, many transition metal complexes are paramagnetic, which has ground states with unpaired electrons. Recall Hund's rule, which states that for orbitals of similar energies, electrons will fill the orbitals to maximize the number of unpaired electrons before pairing up. Transition metals have partially populated d-orbitals...
06:14
Chemical Amputation and Regeneration of the Pharynx in the Planarian Schmidtea mediterranea
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Cited by 3 •
2018
The planarian Schmidtea mediterranea is an excellent model for studying stem cells and tissue regeneration. This publication describes a method to selectively remove one organ, the pharynx, by exposing animals to the chemical sodium azide. This protocol also outlines methods for monitoring pharynx regeneration.
03:53
Balmer Series - Concepts
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2020
The Bohr Model Niels Bohr proposed a model for the hydrogen atom in 1913 that described discrete energy states are associated with a fixed electron orbit around the nucleus. Importantly, an atom cannot discharge energy while its electrons are in stationary states. An electron can only emit energy by changing energy states. To change energy states, an electron must move from one orbit to another by either absorbing or emitting energy. This change can only occur if the absorbed or emitted energy...
02:45
The Quantum-Mechanical Model of an Atom
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2020
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
FAQs
The g-factor modifies the magnetic moment associated with electron spin, so a measured value is not interpreted from angular momentum alone. It accounts for how spin contributes to the observed magnetic behavior relative to the natural Bohr magneton scale. Including this factor helps chemists relate magnetic measurements to the electronic structure responsible for an atom or molecule’s moment.
Orbital motion and spin provide separate contributions to an electron’s magnetic moment. Their combined effect determines the moment expressed in Bohr magnetons, while the spin contribution is additionally influenced by the g-factor. Considering both sources is important because magnetic behavior reflects the total electronic arrangement rather than only one type of angular momentum.
A magnetic moment expressed in Bohr magnetons helps identify whether a substance has magnetically active unpaired electrons or an arrangement without such a contribution. Chemists use this information alongside magnetic susceptibility to distinguish paramagnetic behavior from diamagnetic behavior. The distinction provides a direct connection between an observed magnetic response and the substance’s electron arrangement.
Chemists compare a measured magnetic moment, expressed in Bohr magnetons, with the magnetic behavior expected from different numbers of unpaired electrons. This comparison provides an estimate of how many electrons contribute to the moment. The result is especially useful when evaluating whether a proposed electronic configuration is consistent with the observed magnetic susceptibility.
In coordination chemistry, magnetic-moment measurements help assess the electronic configuration of a transition-metal complex. They can support interpretation of the metal’s oxidation state and indicate how its electrons are arranged in the coordinated environment. Expressing the result in Bohr magnetons gives chemists a common scale for comparing magnetic behavior among related complexes.
Oxidation state and ligand-field effects can change the electronic configuration of a transition-metal center, which in turn changes its magnetic moment. Chemists therefore use Bohr magneton values as evidence when evaluating competing assignments for a complex. Comparing the measured magnetic behavior with proposed configurations helps determine whether the oxidation state and ligand-field interpretation are chemically consistent.