An element is considered to be a pure substance because it cannot be broken down into its constituents and other simpler substances.
A pure substance refers to a chemical substance that has a constant (fixed) and definite structure, and they are typically made up of only one kind of particles. Thus, a pure substance is any chemical substance that comprises a particular type of particles, and has a constant (fixed) chemical composition and properties.
Consequently, pure substances being a chemical substance cannot be separated into its constituents by a physical separation method or technique.
Similarly, all chemical elements are pure (chemical) substances because they cannot be separated or broken down into their constituents and other simpler substances.
In conclusion, an element is considered to be a pure substance because it cannot be broken down into its constituents and other simpler substances.
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