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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