The molecular structure of the methane molecule, CH 4, is shown with a tetrahedral arrangement of the hydrogen atoms.VSEPR structures like this one are often drawn using the wedge and dash notation, in which solid lines represent bonds in the plane of the page, solid wedges represent bonds coming up out of the plane, and dashed lines represent bonds going down into the plane.
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According to VBT: lone pair-lone pair repulsion is more than a bond pair -lone pair repulsion.As the number of lone pair of electrons on central element increases, repulsion between that lone pair of electrons increases and therefore, bond angle decreases. Molecules Bond angle CH4 (no lone pair of electrons) 1090.5 NH3(one lone pair of electrons) 107.50 H2O (two lone pair of electrons) 104.450
parts in which you will explore molecular geometries both by building balloon models and using molecular model kits. The shape of a molecule is important for a variety of reasons. The melting point, boiling point, density and reactivity of a molecule are all influenced by its shape. There are a number of ways to determine the shape of molecules.