Answer
[Xe] 6s²
Step-by-step explanation
The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
The alkaline earth metal in period six is barium with the symbol Ba and atomic number 56. Its has an abbreviated electron configuration of: [Xe] 6s²