How might an advanced civilization separate astronomical amounts of Magnesium Ions from astronomical amounts Oxygen Ions?

An advanced civilization collects enough Magnesium and Oxygen, from all over the Galaxy, to equal the mass of a star, and then reacts the Magnesium and Oxygen to produce Magnesium Oxide. The civilization then decides to separate the Magnesium Ions from the Oxygen Ions and put all the Magnesium Ions into one region of space in order to give that region of space a significant positive electric charge, and put all the Oxygen Ions into another region of space in order to give that region of space a significant negative electric charge.

How might this advanced civilization separate the Magnesium from the Oxygen Ions while keeping the Magnesium and Oxygen Ions in Ionic form?

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How might an advanced civilization separate astronomical amounts of Magnesium Ions from astronomical amounts Oxygen Ions?

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