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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, ...

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

the way I understand it is that all things in the universe try to move towards a situation of least energy. Let a ball go and it falls or rolls down a hill so that potential ...

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 ...

skyserver.sdss.org/dr1/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 ...

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.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.

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

Select element from periodic table · Iodine Atomic Data · Iodine Strong Lines · Iodine Neutral Atom Persistent Lines · Iodine Neutral Atom Energy Levels · Iodine  ...

physics.nist.gov/PhysRefData/Handbook/Tables/kryptontable5.htm

Select element from periodic table · Krypton Atomic Data · Krypton Strong Lines · Krypton Neutral Atom Persistent Lines · Krypton Neutral Atom Energy Levels ...

link.aps.org/doi/10.1103/PhysRev.73.36

An energy-level scheme is given for sodium chloride. Its predictions are compared with observations in the ultraviolet and x-ray regions and color-center  ...