Exercise with Solution-2: VSEPR Model

Question:

Draw a correct Lewis Structure for SF₄ and decide on its electron domain
and molecular geometries then estimate the F−S−F bond angle.

Solution:

Based on the rules previouly mentioned, the the correct Lewis Structure of SF₄ is:

The central atom (S) has 5 electron domains; the electron-domain geometry is:

Since there is a non-bonding pair of electrons, the molecular geometry is:

In this geometry, there are two angles; 120° and 180°

However, because of the non-bonding pair, these angles are a little bit different.

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