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II A : Be, Mg, Ca, Sr, Ba, Ra
III A : B, Al, Ga, In, Ti
IV A : C, Si, Ge, Sn, Pb
V A : N, P, As, Sb, Bi
VI A : O, S, Se, Te, Po
VII A : F, Cl, Br, I, At
VIII A : He, Ne, Ar, Kr, Xe, Rn