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Which statement best describes the structure of an atom?
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2. Atoms & Elements
The Atom
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Which of the following is the number of protons found in an atom of argon?
A
40
B
22
C
18
D
8
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Recall that the number of protons in an atom is given by its atomic number, which is unique to each element.
Identify the element in question, which is argon in this problem.
Look up argon's atomic number on the periodic table; this number represents the number of protons in an argon atom.
Understand that the atomic number is not the same as the atomic mass (which is approximately 40 for argon), but specifically the count of protons.
Conclude that the number of protons in argon corresponds to its atomic number, which is 18.
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