Praxis 5511 Practice Test Practice Question
The arrangement of elements on the periodic table is based on their
Correct Answer: B
Rationale: The periodic table organizes elements primarily by atomic number, which reflects the number of protons in an atom's nucleus. This arrangement ensures that elements with similar properties are grouped together, facilitating the understanding of chemical behaviors.
Option A, atomic mass, was historically used but can lead to inaccuracies due to isotopes. Option C, the number of neutrons, varies among isotopes of the same element and does not define their chemical properties. Option D, density, is not a fundamental property for arrangement and varies under different conditions. Thus, atomic number provides a consistent and logical framework for the periodic table.
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