alleryStart learning →In the modern periodic table, elements are arranged by:
AAtomic mass of each element
BAtomic weight only of element
CNumber of neutrons in nucleus
DAtomic number (number of protons)
Answer & Solution
Correct answer: D. Atomic number (number of protons)
The modern periodic table is arranged by ATOMIC NUMBER (number of protons), introduced by Henry Moseley in 1913. Mendeleev's original 1869 table used atomic mass.
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