Chemistry: How to distinguish components from the composition of matter?

Generally speaking, "composition" emphasizes the components themselves, but does not emphasize the relationship between components; "Composition" focuses more on the relationship between components, such as structure.

Therefore, it is often said that the mixture is composed of several pure substances; A substance is composed of several elements: one element in nature is composed of several isotopes; A molecule consists of several atoms: a crystal is composed of some particles (ions, atoms or molecules) through chemical bonds or molecular bonding forces; Wait a minute.

Accurately speaking, the concepts of macro and micro are not absolute here, but it is rare to discuss composition from micro and macro perspectives in middle school chemistry. It is one of the misleading conclusions of junior high school chemistry popularity to emphasize the use of "composition" in macro and "composition" in micro.

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