What is the atomic configuration for Cesium (Cs)?

The atomic configuration for Cesium (Cs) is [Xe] 6s¹. Cesium is in group 1 of the periodic table, which means it has one electron in its outermost s orbital. The atomic number for Cesium is 55, and when constructing its electron configuration, we start by filling the lower energy levels, leading up to the noble gas xenon (Xe), which has an electron configuration of [Xe] 5s² 4d¹⁰ 5p⁶. After xenon, Cesium has one additional electron that goes into the 6s subshell. Thus, its complete electron configuration is [Xe] 6s¹.

This understanding is essential for determining the correct configuration. The configuration options provided show different fill patterns for various elements. The choice that reflects the one outermost electron in the 6s orbital after the noble gas core correctly represents Cesium's placement within the periodic table and its chemical properties as an alkali metal.