1.3 Atomic Structure: Electron Configurations

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8 Terms

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Ground-state electron configuration
The lowest-energy arrangement of an atom's electrons in orbitals.
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Aufbau principle
The rule stating that the lowest-energy orbitals fill up first.
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Pauli exclusion principle
The rule that states two electrons can occupy an orbital only if they have opposite spins.
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Hund's rule
The rule stating that electrons occupy degenerate orbitals singly with parallel spins before pairing up.
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1s configuration
The ground-state configuration for hydrogen, indicating one electron in the lowest-energy 1s orbital.
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Superscript in electron configuration
Indicates the number of electrons in a particular orbital.
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Orbital energy levels
The order of energy in which electrons occupy orbitals, with lower energy levels filled first.
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Electron spin
The property of electrons that can be oriented as either 'up' (↑) or 'down' (↓).