5005 Praxis 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 arrangement reflects the atomic number, which defines each element.
Option A is incorrect as it suggests that elements are organized by neutrons, which does not determine their position in a row. Option B also misrepresents the organization, implying a decrease in neutrons, which is not the basis for the periodic table's layout. Option D incorrectly states that protons decrease across a row, contradicting the fundamental principle of atomic structure.
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