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sodium is most reactive , followed by potassium as they are alkali metals.. The alkali metals react quickest followed by the alkaline earth metals, found in the leftmost two groups of the periodic table. The transition metals take much longer to oxidize (such as iron, copper, zinc, nickel). Others, like palladium, platinum and gold, do not react with the atmosphere at all. Some metals form a barrier layer of oxide on their surface which cannot be penetrated by further oxygen molecules and thus retain their shiny appearance and good conductivity for many decades (like aluminium, some steels, and titanium). The oxides of metals are basic (as opposed to those of nonmetals, which are acidic), although this may be considered a rule of thumb, rather than a fact.
Potassium would be the most reactive. Ionization energy increases as you go up and to the right on the periodic table. This means that Potassium would most easily give up its outer electron to form an ion.
I'm searching for the other two reasons now, but that is the primary reason.
potassium is the most reactive. it is from grp I, the alkali metals. as it progresses down the grp, the metals get more reactive. so, meaning, francium is the most reactive in the grp, and of all metals.
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