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Identify electron configurations

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How would I find/identify the expected electron configuration for: Cr3+, Au3+, Ru2+ Cu+, Mn4+, and Ir3+?

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<br>To predict a ground state electronic configuration:

1)Aufbau principle - Lowest energy orbitals fill first

Order of increasing energy:
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f

2) Pauli exclusion principle - No 2 electrons can have the same set of quantum numbers (maximum of 2 electrons per orbital)

3)Hund's rule - When filling degenerate orbitals preserve the maximum ...

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