Organic Chemistry A study of carbon compounds H He Be B Ne Na Mg Al Si Ar Sc Ti Cr Mn Fe Co Ni Cu Ga Ge Se Br Kr Rb Sr Zr Nb Sn Xe Cs Ba La Hf Ta Re Os Ir Au Hg T Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt 2004 Thon Although C is the principal element in organic compounds,most also contain H,and many contain N,O,P,S.CI or other elementsOrganic Chemistry „ A study of carbon compounds „ Although C is the principal element in organic compounds, most also contain H, and many contain N, O, P, S. Cl or other elements