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Which of the following best describes an element?
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2. Atoms & Elements
The Atom
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Which of the following are defined as the basic units of matter?
A
Protons
B
Molecules
C
Electrons
D
Atoms
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Understand the question: It asks for the basic units of matter, which means the smallest units that retain the properties of an element.
Recall definitions: Protons and electrons are subatomic particles, which are components of atoms but not units of matter themselves.
Consider molecules: Molecules are combinations of two or more atoms bonded together, so they are not the most basic units.
Identify atoms: Atoms are the smallest units of matter that define the chemical elements and retain their properties.
Conclude that atoms are the basic units of matter because they are the fundamental building blocks from which all substances are made.
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