We are asked to determine the ion formed when barium achieved stable electron configuration.
To do this, we shall first write the electron configuration.
We can determine the ground-state electron configuration of Barium (Ba) by referring to the periodic table and locating the position of Ba in the periodic table.
Ground-state means that the element is in its lowest energy form (not in excited state).
Write the symbol for the ion formed when the following atom achieve a stable electron configuration:
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