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codicat
Most reactive non-metals: the halogens in group 7 (at right of table) 
More reactive as you go up group 

Most reactive metals: the alkali metals in group 1 (at left of table). More reactive as you go down the group
jdele1018
on the right side. periods 1 2 3 4 5 and 6 letters H,He, B, C, N, O, F, Ne, Si, P, S, Cl, Ar, Ge, As, Se, Br,  Kr, Sb, Te, I, Xe, At, Rn,

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