Thursday, November 11, 2010

Exam Review

7.)Describe the different principles that govern the building of an electron configuration.

The Pauli Exclusion Principles states that the orbitals can only hold 2 electrons, and the electrons must have an opposite spin because, it minimizes repulsions between the electrons(can never have the same spin in one orbital).

The Aufbau Principle states that electrons occupy orbitals of the lowest energy first, for example the 4s orbital fills before the 3d orbital.

Hunds Rule says that if their are multiple orbitals the electrons have to fill 1 electron in each orbital before an orbital gets its second electron.


  1. This was good but could use some pictures or somthing else to look at. Otherwise, very well done and keep up the good work.

  2. Yes, I agree with paxton. Some sample electron configurations and orbital filling diagrams would have been good. I also think you should have covered the filling order since a number of people struggle with that.