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Potassium.
Gold
The metals highest on the list are the least stable.
Answer is potassium. You have seen silver,iron and aluminium. You must not have handled potassium.
The metals highest on the list are the least stable.
Metals will LOSE electrons to become stable.
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".
Metals and non metals attain stable configurations by ionic bonding.
There is no rule about this. Gold is a very stable metal, and neon is a very stable non-metal.
Potassium is very unstable as it is part of the alkali metals part of the periodic table, it will react to water, by blowing up.
Tantalum, platinum and gold are very stable metals and have low reactivity.
Noble gases are most stable due to the presence of octet of electrons