Chemistry-Periodic Table
NEET Chemistry Periodic Table Assertion Reason Question
Type: Assertion Reason-assertion-Hard-Class 11
Assertion (A): The modern periodic law is based on atomic number rather than atomic mass. | Reason (R): The first ionization enthalpy of sodium is lower than that of magnesium.
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.
Correct Answer
Option B
Detailed Explanation
The modern periodic law is indeed based on atomic number, but the given reason about ionization enthalpy does not explain this assertion. The periodic law is a result of the discovery of atomic number's fundamental role, not ionization enthalpy trends.
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