Is phosphorus gaining or losing electrons? Asked by Alan Rios A phosphorus atom has 5 valence electrons and gains 3 electrons to attain a noble-gas configuration. Sarah Taylor, BA Contributor 4.4/535 ratings Rate this answer Leave your comment You may be interested inDoes phosphorus gain or lose electrons to form an ion? Phosphorus has 5 valence electrons. It can lose 5 electrons to form a ion and it can gain 3 electrons to form a -3 ion.Does phosphorus gain or lose electrons? Phosphorus tends to lose 5 electrons and gain 3 electrons to complete it's octet.