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Question
The arrangement of elements in the Modern Periodic Table is based on their ______.
Options
increasing atomic mass in the period
increasing atomic number in the horizontal rows
increasing atomic number in the vertical columns
increasing atomic mass in the group
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Solution
The arrangement of elements in the Modern Periodic Table is based on their increasing atomic number in the horizontal rows.
Explanation:
Elements in the Long Form of the Periodic Table are arranged sequentially by their increasing atomic numbers from left to right along the horizontal periods.
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