Chapter 3: Periodic Properties of the Elements

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6 Terms

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Hund’s Rule

When filling orbitals that have the same energy (degenerate), place one electron in each orbital before completing pairs

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Aufbau Principle

Energy levels and sublevels fill from lowest energy to highest: s → p → d → f; orbitals that are in the same sublevel (l value) have the same energy

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Core electrons

Electrons in lower energy shells

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Valence electrons

The electrons in all the sublevels with the highest principal energy shell

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Halogens

Nonmetals with one fewer electron than the next noble gas

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Noble gases

Have 8 valence electrons except for He