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Hi ^^ so i'm wondering, cause it was never really explained properly to me, why does a passivating metal produce it's little oxide shield against complete corrosion :s I'm a little confused, (also important cause i just found its a syllabus point xD)

Ok so i think this question is impossible without another piece of info, but i just wanna post it and see if anyone is amazing enough to get it ^^ --> Two planets orbit a star of mass 10^32 kg. Planet A has a mass of 10^24 kg and planet B a mass of 10^26 kg. Planet A is 1.5x10^11 m from the...