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Mg, magnesium always is forming magnesium oxide as an outer shell, this is why when you sand it it often becomes more lustrous. Same goes for aluminium and iron forms rust when mixed with water however this is more gradual than an oxide layer, the iron hydroxide layer is clearly more visible. However, they all appear quite stable depending on what you mean by "least stable".

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How does the activity series of metal reflect the stability of metals?

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Answer is potassium. You have seen silver,iron and aluminium. You must not have handled potassium.


How does activity series of metals reflect the stability of metals?

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