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Which statement best explains how the mass of an atom is organized?
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2. Atoms & Elements
The Atom
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A mystery element has 18 protons. Which one of the following statements is true about the element?
A
It is a metal.
B
It is argon (Ar).
C
It is neon (Ne).
D
It has an atomic number of 8.
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Identify the element by its number of protons. The number of protons in an atom is equal to its atomic number, which uniquely identifies the element.
Since the mystery element has 18 protons, its atomic number is 18.
Look up the element with atomic number 18 on the periodic table. This element is argon (Ar).
Recall that argon is a noble gas, which is a nonmetal, not a metal.
Therefore, the correct statement is that the element is argon (Ar), and it has an atomic number of 18, not 8 or neon.
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