PPT Slide

19

Expanded valence shells.

An example is sulfur hexafluoride (SF6).

Another example is phosphorus pentachloride (PCl5).

• Many molecules and ions have more than eight valence electrons around the central atom.

• To accommodate more pairs, the central atom must utilize its empty outer d orbitals in addition to its occupied s and p orbitals.

• In molecular compounds, expanded valence shells occur only around a central non-metal atom from Period 3 or higher.

• An atom expands its valence shell to form more bonds, a process that releases energy.

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