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Chapter 4

Electron configurationElectron configuration is the arrangement of electrons in atoms.
Aufbau principleAccording to the Aufbau ('building up' in German) principle, an electron occupies the lowest-energy orbital that can receive it.
Hund's RuleAccording to Hun's rule, orbitals of equal energy are each occupied by one electron before any one orbital is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin.
Pauli exclusion principleAccording to the Pauli exclusion principle, no two electrons in the same atom can have the same set of four quantum numbers.
highest occupied energy levelThe highest occupied energy level is the electron-containing main energy level with the highest princeipal quantum number.
inner-shell electronsInner-shell electrons are electrons not in the highest occupied energy level.
noble gasesThe Group 18 elements (helium, neon, argon, drypton, xenon, and radon) are called the noble gases.
noble gas configurationA noble gas configuration is an outer main energy level fully occupied, in most cases, by eight electrons.

Anna Megill

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