1.Substance b&c chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. ... A sample of any given pure element is composed only of the atoms characteristic of that element, and the atoms of each element are unique.
2.Substance a&d Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
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1.Substance b&c chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. ... A sample of any given pure element is composed only of the atoms characteristic of that element, and the atoms of each element are unique.
2.Substance a&d Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.