We can confirm that the largest principal quantum number in the ground-state electron configuration of barium is 6.
Why is this number 6?
The principal quantum number in the ground-state electron configuration is a number that is used to represent the orbital energy of the compound. It is also always never a negative number. In this case, we are referring to the ground state, which is the lowest level of energy and therefore barium is only a 6.
Therefore, we can confirm that the largest principal quantum number in the ground-state electron configuration of barium is 6.
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