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Where is most of the mass of an atom located?
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2. Atoms & Elements
The Atom
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An element is a pure substance that contains how many kinds of atoms?
A
Three kinds of atoms
B
Two kinds of atoms
C
One kind of atom
D
Many kinds of atoms
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Recall the definition of an element in chemistry: An element is a pure substance that consists entirely of one type of atom.
Understand that atoms are the smallest units of an element that retain the chemical properties of that element.
Recognize that elements differ from compounds, which contain two or more kinds of atoms chemically bonded together.
Therefore, an element contains only one kind of atom, which distinguishes it from mixtures or compounds.
Conclude that the correct answer is that an element contains one kind of atom.
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