A single water molecule consists of an oxygen atom with two hydrogen atoms attached to it. The three atoms, H-O-H make and angle of approx 105 degrees rather than lie in a straight line. However, in liquid water, the lone hydrogen atoms bond with neighbouring water molecules in form tetrahedral forms.
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To determine the structural geometry of a molecule, structural pair geometry must be used. These are the amounts of pairs found surrounding a specific molecule, and they are unique to each type of atom.
trigonal planar
Yes, the geometry of a molecule influences its overall polarity. If a molecule has polar bonds but is symmetric in shape, then the polarities of those bonds cancel out, resulting in a nonpolar molecule. However, if the molecule's geometry is asymmetric, then the polarities of the bonds do not cancel out, and the molecule is polar.
Because of the way the hydrogens bond to the oxygen in water, the molecular geometry is a bent or angular shape, and the oxygen has 2 lone pairs of electrons. This makes the oxygen part of the water molecule rather negative relative to the hydrogen part of the molecule, which is rather positive. Thus, there is a separation of charge, and this is what makes the water molecule so polar.
This is a linear molecule.