Which term denotes a pure substance composed of only one type of atom?

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Multiple Choice

Which term denotes a pure substance composed of only one type of atom?

Explanation:
An element is defined as a pure substance consisting of atoms all of the same kind. That means every particle in the substance is the same type of atom, whether those atoms exist as isolated atoms or paired as diatomic molecules like O2 or N2. This single-type composition distinguishes elements from other categories: a molecule is simply a cluster of atoms bonded together and can involve different atoms or the same, while a compound is made from two or more different elements in fixed proportions. An atom is the basic unit that makes up elements, not a substance by itself in the common sense of defining pure substances.

An element is defined as a pure substance consisting of atoms all of the same kind. That means every particle in the substance is the same type of atom, whether those atoms exist as isolated atoms or paired as diatomic molecules like O2 or N2. This single-type composition distinguishes elements from other categories: a molecule is simply a cluster of atoms bonded together and can involve different atoms or the same, while a compound is made from two or more different elements in fixed proportions. An atom is the basic unit that makes up elements, not a substance by itself in the common sense of defining pure substances.

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