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The electron-group geometry of a water molecule (H₂O) is tetrahedral because it has four regions of electron density: two bonding pairs (O-H bonds) and two lone pairs of electrons on the oxygen atom. However, the presence of the two lone pairs causes repulsion that pushes the hydrogen atoms closer together, resulting in a bent molecular geometry. This deviation from the tetrahedral arrangement gives water its characteristic angle of approximately 104.5 degrees.

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