MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
What is the basis of Newlands' law of octaves?
Think it through first, then pick an option.
- a Atomic number
- b Atomic mass
- c Number of neutrons
- d Electronic configuration
Answer and explanation
Correct answer: b Atomic mass
Newlands arranged elements from lower to higher atomic mass.
Why the other options are wrong
- a Atomic number: Atomic number is the basis of the modern periodic law. The answer is Atomic mass.
- c Number of neutrons: Neutron number is not the basis of any periodic law. The answer is Atomic mass.
- d Electronic configuration: Electronic configuration is the basis of the modern table. The answer is Atomic mass.
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