What is the full electron configuration of barium?

The full electron configuration of barium (Ba), which has an atomic number of 56, is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s². This configuration indicates that barium has two electrons in its outermost shell, corresponding to its position in group 2 of the Periodic Table as an alkaline earth metal.