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Unstable, because oxygen is a diatomic element meaning that O (charge of -2) cannot stand alone, when not in a compound it must be O2. So it has a charge of -4.
Answer by Banana54. Confidence votes 2.7K. O2 is oxygen. Oxygen has a valency of 2; it's a highly reactive element, so, if it can't find any other atoms to join up with, it always pairs up with itself & becomes the diatomic molecule O2 which is the form of oxygen we're all familiar with.odern electronic fuel injection and emission control is possible because of O2 sensor. O2 sensor helps to d â¦ etermine if the air fuel ratio of a car engine is rich or lean. O2 sensor is located in the exhaust system near catalytic convertor.