What happens when Ba (barium) and O (oxygen) combine?

Barium reacts with oxygen when exposed to air, forming a thin passivating layer of BaO on the surface. When ingnited, barium reacts with both oxygen and nitrogen, forming a mixture of BaO, Ba 3N 2 and BaO 2.

Explanation:

So, one ion of barium neutralizes one ion of oxygen, and so those two combine to form barium oxide, BaO .

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