# How many valence electrons does Arsenic have?

It's electron configuration is $1 {s}^{2}$ $2 {s}^{2}$ $2 {p}^{6}$ $3 {s}^{2}$ $3 {p}^{6}$ $3 {d}^{10}$ $4 {s}^{2}$ $4 {p}^{3}$. It's outermost shell (4s and 4p) has 5 electrons, these are the valence electrons.