lanthanides especially transition metals zinc copper palladium nickel cobalt titanium chromium organic compounds form basis earthly life constitute majority known chemicals bonding patterns carbon valence four formal single double triple bonds plus structures delocalized electrons make array organic compounds structurally diverse range applications enormous form basis constituents many commercial products including pharmaceuticals petrochemicals agrichemicals products made including lubricants solvents plastics fuels explosives study organic chemistry overlaps organometallic
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