What is the electronic configuration of astatine?

This is very rare element, with an electronic structure of $\left[X e\right] 4 {f}^{14} 5 {d}^{10} 6 {s}^{2} 6 {p}^{5}$. The element thus has the same electronic structure as the higher halogens. Probably the material is too rare for chemists to investigate its reactivity definitively.