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Which of the following best explains why the periodic table is considered a useful tool in chemistry?
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2. Atoms & Elements
Periodic Table: Classifications
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How are elements ordered on the periodic table?
A
By the number of neutrons in the nucleus
B
By alphabetical order of element names
C
By increasing atomic mass
D
By increasing atomic number
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Understand that the periodic table is a systematic arrangement of elements based on their atomic structure.
Recall that the atomic number of an element is the number of protons in its nucleus, which uniquely identifies each element.
Recognize that elements are ordered on the periodic table by increasing atomic number, not by the number of neutrons, alphabetical order, or atomic mass.
Note that ordering by atomic number reflects the periodic law, which states that the properties of elements repeat periodically when elements are arranged by increasing atomic number.
Conclude that the correct way to order elements on the periodic table is by increasing atomic number, ensuring a consistent and meaningful organization of elements.
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