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en.wikipedia.org/wiki/Energy_level

A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy. This contrasts with classical particles, which can have any energy. These discrete values are called energy levels. The term is commonly used for the energy levels of electrons in atoms, ions, ...

en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Energy_Levels

As an electron approaches a nucleus from infinity, it becomes 'bound' - it is attached to the nucleus, if you like. In this bound state, the electron occupies what is ...

www.khanacademy.org/science/physics/quantum-physics/atoms-and-electrons/v/atomic-energy-levels

In this video, David explains how an atom can absorb and emit photons of particular values and how to determine the allowed values.

cas.sdss.org/dr2/en/proj/advanced/spectraltypes/energylevels.asp

Its energy levels are given in the diagram below. The x-axis shows the allowed energy levels of electrons in a hydrogen atom, numbered from 1 to 5. The y-axis ...

www.khanacademy.org/science/physics/quantum-physics/atoms-and-electrons/v/bohr-model-energy-levels

Calculating electron energy for levels n=1 to 3. Drawing a shell model diagram and an energy diagram for hydrogen, and then using the diagrams to calculate ...

www.britannica.com/science/atom/Orbits-and-energy-levels

atom - Orbits and energy levels: Unlike planets orbiting the Sun, electrons cannot be at any arbitrary distance from the nucleus; they can exist only in certain ...

physics.nist.gov/PhysRefData/Handbook/Tables/iodinetable5.htm

Configuration, Term, J, Level(cm-1), Ref. 5p5, 2P°, 3/2, 0.00, M62. 1/2, 7603.15, M62. 5p4(3P2)6s, 2[2], 5/2, 54633.46, M62. 3/2, 56092.88, M62. 5p4(3P0)6s, 2[0]  ...

www.radioactivity.eu.com/site/pages/Atomic_Levels.htm

Atomic Energy Levels. A shell structure .... Humanity's increased understanding of space has familiarized us to the concept of a satellite orbiting our planet.

www.hopkinsmedicine.org/health/healthy_aging/healthy_body/age-defying-energy-levels

Age doesn't have to drain your energy levels. Discover how to get more energy and feel your best every day with these tips from a Johns Hopkins expert. Try It.