I agree P is +5 but not for that reason. PCl5 is zero charge as is all compounds. Cl is -1 so P must be +5 to balance at zero.
You are correct! The valence of phosphorus in phosphorus pentachloride (PCl5) is indeed 5. Phosphorus belongs to Group 15 in the periodic table, which means it has 5 valence electrons. In phosphorus pentachloride, phosphorus forms covalent bonds with five chlorine atoms, and each chlorine atom contributes one electron to form a shared bond with phosphorus. Therefore, phosphorus utilizes its 5 valence electrons to form bonds with the chlorine atoms, resulting in a valence of 5 for phosphorus in phosphorus pentachloride.
