Chemistry-Periodic Table
NEET Chemistry Periodic Table Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 11
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.
A
Both (A) and (R) are true and (R) is the correct explanation of (A).
B
Both (A) and (R) are true but (R) is not the correct explanation of (A).
C
(A) is true but (R) is false.
D
(A) is false but (R) is true.
Correct Answer
Option A
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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