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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.
stable is what the amp can play to, without damaging itself. So, 2 ohm stereo stable means that in stereo mode (two channels) it can play as low as 2 ohms. 4 ohm stable bridged means that when you bridge the amp (combine the channels, also called mono) it can only play to 4 ohms.