Electron Configurations

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Electron Configurations Electron configurations show the arrangement of electrons in an atom. A distinct electron configuration exists for atoms of each.

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Presentation transcript:

Electron Configurations Chapter 4

Aufbau Principle Electrons occupy the lowest energy level orbital that can receive them

Electron Configuration The order and arrangement of electrons in an atom

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8s This is the order used to place electrons- follow the arrows to their “end”, then move to the next arrow

Hund’s Rule Orbitals of equal energy are each occupied by one electron before being occupied by a second electron All electrons in “single orbitals” must have the same spin state

Orbital Notation Use groups of boxes or lines to designate the sub-orbitals within 1 orbital Arrows are used to represent electrons occupying these boxes AND their spin state

Electron Arrangement Aluminum (13) Scandium (21) Potassium (19) 1s2 2s2 2p6 3s2 3p1 Scandium (21) 1s2 2s2 2p6 3s2 3p6 4s2 3d1 Potassium (19) 1s2 2s2 2p6 3s2 3p6 4s1

Noble Gas Arrangements Aluminum (13) [Ne] 3s2 3p1 Scandium (21) [Ar] 4s2 3d1 Potassium (19) [Ar] 4s1