Multiple Choice
How are the elements arranged in the modern periodic table?
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4. Atoms and Elements
Periodic Table: Classifications
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In Mendeleev’s original periodic table, what primary criterion did he use to arrange the elements?
A
By increasing atomic number, grouping elements by identical numbers of protons
B
By increasing atomic radius, arranging elements from smallest to largest atoms
C
By increasing atomic mass, grouping elements with similar chemical properties into the same columns
D
By increasing electronegativity, placing the most electronegative elements first
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