Home Chemistry Classification of Elements and Periodicity Assertion & Reason In this type of questions, a statement of as…
Chemistry Classification of Elements and Periodicity Assertion & Reason Single Correct MCQ
Published on: August 13, 2026

In this type of questions, a statement of assertion

A
is followed by a statement of reason (R). Mark the correct choice as: Assertion: According to Mendeleev, periodic properties of elements is a function of their atomic masses.
Reason: Atomic number is equal to the number of protons. If both assertion and reason are true and reason is the correct explanation of assertion.
B
If both assertion and reason are true but reason is not the correct explanation of assertion.
C
If assertion is true but reason is false.
D
If assertion is false but reason is true.

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The correct answer is:
B

Mendeleev's periodic table was based purely on the basis of atomic masses. Atomic numbers are the number of protons in the nucleus.

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