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PERIODIC CLASSIFICATION OF ELEMENTS, Periodic Table of Elements, 18, Не, Be, Ne, AI, Na Mg, Si, P, CI, Ar, 12, K, Ca, 21 22 ce 23, Ti, V, Sc, Cr Mn, Fe, 27 28 29, Ni, Cu, Co, Zn, Ga Ge, As, Se, Br, Kr, 37, Rb, Zr, Nb Mo, Ru Rh Pd, Ag, In, Sn, Sb, Te, Cs, Ba, Hf, Ta, W, Re Os, Ir, Pt, Au Hg, Ti, Pb, BI, At, Rn, 80-103, 104, 112, 117, Ra, Db, Sg, Bh, Hs Mt Ds Rg, Cn, e463, La, Ce, Pr Nd Pm Sm, Eu Gd Tb, Dy Ho, Er Tm Yb, Lu, 102, 103, Ac, Th, Np, Pu Am Cm Bk, Cf, Es Fm Md No, Substomes Containing atoms f only, ELEMENTS, one type eg: NG. mg, Au. Al oete., O There are around 118 elements known tog., O Elements are classified to make the Study, eary-, Lavoisier classification, O Lavoisier clastified elements in to too Catagories-, ELEMEN TS, Chemistry, By- NAAZ RAFEEQ, METALS, e ko loss Krte hai, Electro positive, NON-METALS, e-Ko gain Krte hai, Electonegative