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Essential Rules for Predicting Molecular Geometry

This guide outlines five key rules for predicting the molecular geometry of molecules and ions. Start by sketching the Lewis structure to visualize the arrangement of electrons. Next, count the electron pairs and arrange them to minimize electron-pair repulsion. Determine the position of the atoms based on the sharing of electron pairs. Finally, identify the molecular structure name according to the atomic positions. Remember, double or triple bonds are counted as a single bonding pair in geometry predictions.

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Essential Rules for Predicting Molecular Geometry

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  1. Rules for Predicting Molecular Geometry 1.  Sketch the Lewis structure of the molecule or ion 2.  Count the electron pairs and arrange them in the way that  minimizes electron-pair repulsion. 3.  Determine the position of the atoms from the way the electron pairs are shared. 4.  Determine the name of the molecular structure from the position of the atoms. 5.  Double or triple bonds are counted as one bonding pair when predicting geometry.

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