The electron group geometry of the central atom in H2S is c tetrahedral.
Explanation: In H2S (hydrogen sulfide), the central atom is sulfur (S). Sulfur has six valence electrons, and it forms two single bonds with two hydrogen atoms, using two of its valence electrons. This means that there are two bonding pairs of electrons and two lone pairs of electrons around the sulfur atom.
The presence of these four pairs of electrons (2 bonding pairs + 2 lone pairs) means we first consider the arrangement based on electron pairs. According to the VSEPR (Valence Shell Electron Pair Repulsion) theory, these four pairs will arrange themselves in a way that minimizes repulsion, which is a tetrahedral shape.
However, it’s important to note that the molecular geometry (the shape considering only the atoms) of H2S is bent due to the two lone pairs pushing down on the bonding pairs. But when we talk about electron group geometry, we consider all electron pairs, leading us to conclude that the geometry is indeed tetrahedral.