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en.wikipedia.org/wiki/Energy_level

If there is more than one electron around the atom, electron-electron-interactions raise the energy level. These interactions are often neglected if the spatial overlap of the electron wavefunctions is low. For multi-electron atoms, interactions between electrons cause the ...

www.quora.com/What-is-the-lowest-energy-level-in-an-atom

The “ground state” is the lowest energy level of a quantum system. What that state corresponds to depends significantly upon the atomic or molecular system you're studying. If you have an N-electron system, the ground state can be approximated using the aufbau principle by filling up single particle states (or orbitals) and a ...

www.chem.unt.edu/~roberts/Pics/Spring/TESTprep2/CHP%207.doc

a. is also ionized. b. is an isotope. c. has had its electron moved to the lowest energy level. d. can emit a photon when the electron moves to a lower energy level. e. can emit a photon when the electron moves to a higher energy level.

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.

www.ck12.org/chemistry/energy-level/lesson/Energy-Level-MS-PS

Oct 31, 2012 ... The smallest atoms are hydrogen atoms. They have just one electron orbiting the nucleus. That one electron is in the first energy level. Bigger atoms have more electrons. Electrons are always added to the lowest energy level first until it has the maximum number of electrons possible. Then electrons are ...

cas.sdss.org/DR5/en/proj/advanced/spectraltypes/energylevels.asp

As you may remember from chemistry, an atom consists of electrons orbiting around a nucleus. However, the electrons cannot choose any orbit they wish. They are restricted to orbits with only certain energies. Electrons can jump from one energy level to another, but they can never have orbits with energies other than the ...

study.com/academy/lesson/what-is-an-energy-level-of-an-atom-definition-equation-quiz.html

In this lesson, you will learn about the possible energy states that an electron can have in an atom. You will also understand how these energy...

www.brooklyn.cuny.edu/bc/ahp/SDPS/SD.PS.electrons.html

According to Bohr, the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. These zones are known as energy levels (or sometimes called electron shells). At the lowest energy level, the one closest to the atomic center, there is a single 1s orbital that can hold 2 electrons.

astro.unl.edu/naap/hydrogen/levels.html

The electron in a Hydrogen atom can only have certain energies. These energies are called the Hydrogen's “energy levels”. The different energy levels of Hydrogen are denoted by the quantum number n where n varies from 1 for the ground state (the lowest energy level) to ∞, corresponding to unbound electrons.