Chapter 4.3 : Electron Configuration
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The document outlines objectives for learning about electron configuration including listing the number of electrons in each main energy level, stating the Aufbau principle, Pauli exclusion principle, and Hund's rule, and describing electron configurations using orbital, electron-configuration, and noble-gas notations. It then defines electron configuration and the ground state and provides rules for electron configuration including the Aufbau principle, Pauli exclusion principle, and Hund's rule.
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Chapter 4.3 : Electron Configuration
- 1. Section 4-3 ObjectivesList the total number of electrons needed to fully occupy each main energy level.State the Aufbau principle, the Pauli Exclusion principle, and Hund’s rule.Describe the electron configurations for the atoms of any element using orbital notation, electron-configuration notation, and when appropriate, noble-gas notation.
- 2. Electron ConfigurationThe arrangement of electrons in an atomLowest-energy arrangement – ground-state electron configurationRules Governing Electron ConfigurationAufbau Principle – electron occupies the lowest-energy orbital that can receive it. Pg. 105Pauli exclusion Principle – no two electrons in the same atom can have the same set of four quantum numbersHund’s Rule – orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin.
- 5. Hund’s Rule
- 6. Representing Electron ConfigurationsOrbital NotationNa__ __ __ __ __ __ 1s 2s 2p 3sElectron-Configuration NotationNa 1s22s22p63s1Noble-Gas NotationNa [Ne] 3s1Electron Configuration and the Periodic Table