The electron pair geometry of PCl3 (Phosphorus Trichloride) is tetrahedral.
In PCl3, the central phosphorus atom is surrounded by three chlorine atoms and one lone pair of electrons. According to the VSEPR (Valence Shell Electron Pair Repulsion) theory, the electron pairs around the central atom arrange themselves in a way that minimizes repulsion. This results in a tetrahedral arrangement of the electron pairs.
Although the molecular geometry of PCl3 is trigonal pyramidal due to the presence of the lone pair, the electron pair geometry considers both bonding pairs and lone pairs, leading to a tetrahedral shape.