Final answer:
The electronic configuration of barium (Ba) is [Xe] 6s2.
Step-by-step explanation:
The electronic configuration of barium (Ba) is:
[Xe] 6s2
In barium's ground state, it has 56 electrons. The electron configuration indicates the distribution of these electrons across different energy levels and sublevels. The notation [Xe] represents the electron configuration of the noble gas xenon, which has 54 electrons. The remaining 2 electrons occupy the 6s sublevel in barium.