MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
What was the basis of Mendeleev's periodic table?
Think it through first, then pick an option.
- a Atomic number
- b Atomic size
- c Electronic configuration
- d Atomic mass
Answer and explanation
Correct answer: d Atomic mass
Mendeleev arranged the elements by increasing atomic mass.
Why the other options are wrong
- a Atomic number: Atomic number became the basis later, with Moseley in 1913. The answer is Atomic mass.
- b Atomic size: Atomic size is a periodic property, not the basis for arranging the table. The answer is Atomic mass.
- c Electronic configuration: Electronic configuration is the basis of the modern table, not of Mendeleev's. The answer is Atomic mass.
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