GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Atoms and the Periodic Table

The Electron Configuration: Exceptions (Simplified)

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Most Electron Configuration Exceptions are the result of elements drive to obtain half filled or totally filled d orbitals.

Electron Configuration Exceptions

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The Electron Configuration: Exceptions (Simplified) Concept 1

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p and d subshells are most stable when either half filled or totally filled with electrons.

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The Electron Configuration: Exceptions (Simplified) Concept 2

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The Electron Configuration: Exceptions (Simplified) Concept 3

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When electron configuration ends with d4, an s orbital electron is promoted to d orbital to create half filled orbital:d5.

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The Electron Configuration: Exceptions (Simplified) Concept 4

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When electron configuration ends with d9, an s orbital electron is promoted to d orbital to create completely filled orbital:d10.

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The Electron Configuration: Exceptions (Simplified) Example 1

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Problem

Illustrate the exception to the electron configuration of molybdenum.

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Problem

Which of the following is the correct electron configuration of gold? 

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Problem

A comparison of the electron configurations of palladium (Pd) and silver (Ag) indicates that: