# What is the electron geometry if you have 4 electron groups around the center atom?

The most obvious real example is the water molecule. Around oxygen there are 2 lone pairs, and 2 bonding pairs in the $O - H$ bonds. These are arranged in a tetrahedron to a first approximation.
But we describe molecular geometry on the basis of atomic not electronic geometry. Thus water is a bent molecule, with $\angle H - O - H$ compressed to 104.5""^@ due to the influence of the lone pairs. There should be many other examples of $\text{VSEPR}$ on this site.