NEET Chemistry Periodic Table Assertion Reason Question
Assertion (A): The modern periodic table is arranged based on atomic numbers rather than atomic masses.
Reason (R): Moseley's work on X-ray spectra of elements showed regularities that correlated with atomic numbers.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Correct Answer
Detailed Explanation
Moseley's research provided evidence that atomic number, not atomic mass, determines the properties of elements, leading to the modern periodic table arrangement.
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