CHM120H5 Lecture Notes - Lecture 13: Notation3, Noble Gas, Electron Configuration

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24 Jun 2018

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At. Structure, vsepr, bonding

The Aufbau Process

Aufbau comes from the German word "aufbauen"

meaning "to build."

When writing electron configurations, orbitals are built

up from atom to atom.

When writing the electron configuration for an

atom, orbitals are filled in order of increasing atomic

number. However, there are some exceptions to this

rule.

EXCEPTIONS

Although the Aufbau rule accurately predicts the

electron configuration of most elements, there are

notable exceptions among the transition metals and

heavier elements.

The reason these exceptions occur is that some

elements are more stable with fewer electrons in

some subshells and more electrons in others

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