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a constituent （element）―a component （part）

atomic value

a component （part）―a constituent （element）

an organism

a compound substance

a complex called coordination complex

a chemical compound called ammonia

a chemical compound called ozone

a chemical compound

a polymeric compound

an essential element of an atom, called an atomic nucleus

a chemical compound called amine

an organic compound

a chemical compound called nucleic acid

a （chemical） compound

a mixture

a medley

a miscellany

a compound called acetamide

atom

organic unity

synthetic chemistry

a chemical element

a chemical element

an organic whole

chemical balance

of an organic compound

atomic hydrogen

a chemical equation

a chemical equation