Bohr Model
Bohr Model - 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...
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...
06:32
A Thermoplasmonic Approach for Investigating Plasma Membrane Repair in Living Cells and Model Membranes
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2024
The thermoplasmonic puncture method integrates confocal microscopy, optical tweezers, and gold nanoparticles to study protein responses during plasma membrane repair in cells and giant unilamellar vesicles. The technique enables rapid and localized membrane puncture, allowing the identification of key proteins and their functional roles in the intricate plasma membrane repair machinery.
12:31
In Vivo Modeling of the Morbid Human Genome using Danio rerio
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Cited by 66 •
2013
Here, we present a systematic approach for developing physiologically relevant, sensitive and specific in vivo assays for interpreting variation in human pathology. Transient genetic manipulation via microinjection of WT and mutant human mRNA and morpholino (MO) antisense oligonucleotides harness the tractability of the developing zebrafish embryo to rapidly assay pathogenic mutations, especially, but not exclusively, in the context of human developmental disorders.
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...
FAQs
Shell position matters because electrons in the outermost occupied shell are described as valence electrons, and valence influences how an atom participates in chemical bonding. In biological chemistry, this connection helps link atomic electron arrangements to the formation of stable molecular structures. It provides a conceptual bridge from atomic structure to compounds found in living systems.
An electron transition between permitted shells corresponds to a specific energy change. Absorbing energy moves the electron to a higher permitted level, whereas releasing energy accompanies movement to a lower one. Because these changes are specific rather than arbitrary, the resulting characteristic spectra illustrate how atomic energy structure produces observable patterns.
Modern quantum mechanics gives a more precise description of atomic behavior, but the Bohr model presents shell structure in a comparatively accessible way. That simplified picture makes it easier to introduce electron arrangements, valence, and bonding before students encounter more detailed atomic theory. In biology, it supports an initial explanation of how atoms contribute to molecular organization.
To apply the model, examine an atom’s shell arrangement and focus on the electrons in its outer shell. Their valence-related behavior helps explain why atoms can participate in bonding and combine into molecules. This framework connects atomic considerations with biological examples including water, proteins, carbohydrates, and nucleic acids, without requiring a full quantum-mechanical treatment.
A useful approach is to begin with an atom’s electron arrangement, identify its occupied shells, and then consider the outer-shell electrons as a guide to valence. Next, relate that valence to chemical bonding and finally to molecular examples. This sequence connects atomic structure with the biological compounds discussed in introductory chemistry.
The model is useful as an introductory framework, but it does not provide the most precise account of atomic behavior. Modern quantum mechanics supersedes it for detailed descriptions. In biological study, the Bohr model is therefore best used to establish intuition about shells, valence, and bonding, while recognizing that advanced analysis requires a more precise theory.