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2.5 Condensed Electron Configuration, Valence, and Energy Diagrams

Lesson Summary

Condensed Electron Configuration

• What is the condensed electron configuration of bromine?

Valence Electrons

• What are bromine’s valence electrons?
• How many valence electrons does titanium have?
• When does the d-block count toward an atom’s number of valence electrons?

Energy Diagrams

Aufbau Principle: electrons fill the lowest energy orbitals first.
Hund’s Rule: Don’t pair up electrons until you have to.
Pauli Exclusion Principle: no two electrons in the same atom can have the same four quantum numbers. In other words, no two electrons in the same atom can have the exact same address.