Praxis 5005 Practice Test Practice Question
On the periodic table, elements in the same row are arranged from left to right by
Correct Answer: C
Rationale: Elements in the same row of the periodic table, known as periods, are arranged from left to right by an increasing number of protons in an atom's nucleus. This increase in protons corresponds to a higher atomic number, which defines the element's identity.
Options A and B incorrectly focus on neutrons, which do not determine the arrangement of elements in rows. While neutrons can vary, the primary organizing principle is the atomic number. Option D suggests a decreasing number of protons, which contradicts the fundamental structure of the periodic table, where each successive element has one more proton than the last.
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