The elements are arranged based on their atomic numbers in a periodic table, not based on their atomic masses.
• The chemical elements in the periodic table are demonstrated in order of their atomic number.
• In the modern periodic table, the arrangement of elements is done based on their atomic number, not their relative atomic masses.
• In the periodic table, the horizontal rows, known as periods, show the arrangement of elements in order of increasing atomic number.
Thus, based on atomic numbers, elements are arranged in a periodic table.
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