# What is the valence electron configuration for halogens?

Feb 8, 2014

The Halogens (F, Cl, Br, I, At) are found in column 17 or the fifth column of the 'p' block of the periodic table. This means that each of these elements have an electron configuration that ends as ${s}^{2} {p}^{5}$

F $1 {s}^{2} 2 {s}^{2} 2 {p}^{5}$
Cl $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{5}$
Br $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{5}$

Each Halogen ends in ${s}^{2} {p}^{5}$ with 7 valence electrons.