A pure substance made of only one kind of atom is called what?

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Multiple Choice

A pure substance made of only one kind of atom is called what?

Explanation:
An element is a pure substance made of only one kind of atom. All the atoms in an element are the same type (the same number of protons), which is what gives the element its identity. For example, oxygen can exist as O2, a molecule still made entirely of oxygen atoms, which keeps it classified as an element. A compound, by contrast, contains more than one kind of element. A pure substance can be either an element or a compound, and a molecule is simply a group of atoms bonded together, which can be one element or multiple elements. The description here matches the idea of an element.

An element is a pure substance made of only one kind of atom. All the atoms in an element are the same type (the same number of protons), which is what gives the element its identity. For example, oxygen can exist as O2, a molecule still made entirely of oxygen atoms, which keeps it classified as an element. A compound, by contrast, contains more than one kind of element. A pure substance can be either an element or a compound, and a molecule is simply a group of atoms bonded together, which can be one element or multiple elements. The description here matches the idea of an element.

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