5. Which of the following describes an element? A The simplest substance B. It can be broken down into other types of substances c. It can be separated through a chemical process D. It is composed of two or more types of atoms
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Explanation:
An element is the simplest form of matter that has a unique set of properties. Examples of well-known elements include oxygen, iron, and gold (see the figure below). Elements cannot be broken down into a simpler substance. Likewise, one element cannot be chemically converted into a different element.