Question

What would be the formula of the compound that forms between P and Br?

	a.	PBr
	b.	PBr2
	c.	PBr3
	d.	P3Br
	e.	None of the above

Answer 1

Ans = c) PBr₃

Explanation -

Balanced reaction is

2P + 2Br₃ 2PBr₃

phosphorus have electronic configuration [Ne] 3s²3p³

last shell of phosphorus contain 5 electron therefore require 3 electron to complete octate.

Bromine have electronic configuration [Ar] 3d¹⁰4s²4p⁵

last shell of bromine contain 7 electron therefore require 1 electron to complete octate.

thus 1 phosphorus atom form three bond with 3 bromine atom (single bond with each bromine atom) so, phosphorus octate get completed and all three bromine atom octate get completed therefore compound formed is PBr₃