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Group 1 elements are most reactive. The want desperately to have an octet of electrons but they have 1 too many (or 7 too few depending on how you look at it). And they will do anything to ionize to get that octet. They also get more reactive the larger they get. This is why the smaller halogens which lack a single electron (they are pretty reactive too) are not quite as reactive and why K is more reactive than Na. (NB: Atoms get larger moving down a group and smaller moving from left to right across a period).

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