Which statement correctly describes the electron configuration of cesium (Cs) and highlights its industrial uses, particularly in relation to its reactivity as an alkali metal?

Cesium has the electron configuration [Xe] 6s¹, meaning it has one valence electron in the 6s orbital, which makes it very reactive as an alkali metal. Because that single electron is easily lost, Cs readily forms +1 ions, giving it a strong tendency to react with water and acids, a property exploited in industrial processes. Its high reactivity is useful in producing cesium vapor for atomic clocks, where the precise frequency of the cesium‑133 transition is used as the SI second. In addition, cesium is used in photoelectric cells and in some specialized batteries, where its low ionization energy and large atomic radius help improve performance. Thus, the 6s¹ configuration explains both its vigorous chemical behavior and its practical applications.