Lewis Dot Structure of Phosphorus Tribromide
The outermost layer of a phosphorus (P) atom has 5 electrons, and the outermost layer of a bromine (Br) atom has 7 electrons. In the Lewis Dot Structure of Phosphorus Tribromide ($PBr_ {3} $), the phosphorus atom is in the center position, and it forms a covalent bond with each of the three bromine atoms.
The phosphorus atom takes out 3 electrons and pairs them with each of the three bromine atoms to form a common electron pair, so that there are 3 bonding electron pairs and 1 lone electron pair around the phosphorus atom, and 1 bonding electron pair and 3 lone electron pairs around each bromine atom. The electron is represented by a point, and its Lewis structure is as follows: the P atom has three short lines connected to Br (representing a pair of shared electrons), and the P atom has a pair of lone pairs of electrons represented by two points; in addition to the short lines connected to P, each Br atom has three pairs of lone pairs of electrons represented by six points. In this way, each atom satisfies the octet rule (although the phosphorus atom has a pair of lone pairs of electrons, this structure is more common in its compounds), achieving a relatively stable structure (Lewis Dot Structure For Phosphorus Tribromide).
