The Halogens are the most reactive non-metals. However, their reactivity decreases as you go down the group.
Most reactive Fluorine>Chlorine>Bromine>Iodine>Astatine Least reactive.
However, Astatine is not fully characterised because it is radio-active, and consequently is not found in open(school) labs.
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halogens.
on the right side of the peridic table
Neither. Solid can be the least flexible or the most rigid.
Most common is the thing that happens most, and least common is the least ocuring thing. For example it is most common to open chess with middle pawn forward. And it is least common to move one of the far pawns first.
Most.