Question #f6ecc

1 Answer
Aug 25, 2017

Answer:

Pure substances.

Explanation:

An element is a pure substance composed of atoms with the same number of protons (atomic number). So an element, such as copper, has the same properties throughout.

A compound is a pure substance composed of two or more elements chemically combined. The simplest particles (molecules or formula units) have the same chemical formula, which means a compound has a definite composition, and has the same properties throughout.

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