Final answer:
The electronic geometry of H2O is tetrahedral due to its four electron groups around the central oxygen atom, but the shape of the molecule is bent with an H-O-H bond angle of approximately 104.5 degrees.
Step-by-step explanation:
The electronic geometry of the H2O molecule is tetrahedral. This arrangement is due to the oxygen atom having four electron groups around it: two of these are bonded to hydrogen atoms and the other two are lone pairs of electrons. Although the electronic groups form a tetrahedron, the actual shape of the water molecule is bent or angular. This is because the lone pairs exert greater repulsion on the bonded electron pairs, pushing the hydrogen atoms closer together and creating a smaller H-O-H bond angle of approximately 104.5°, as opposed to the 109.5° angle in a perfect tetrahedron.