Question

define elements in full

Answer 1

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each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms

Answer 2

An element is a pure substance composed of only one kind of atom. An element is composed either of individual identical atoms or of molecules made up of these atoms.