Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The first ionisation enthalpy decreases across a period. Reason R: The increasing nu

Question

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The first ionisation enthalpy decreases across a period. Reason R: The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below:

(A) Both A and R are true and R is the correct explanation of A
(B) A is true but R is false
(C) A is false but R is true
(D) Both A and R are true but R is NOT the correct explanation of A

Prashant Kotian · Accepted Answer

Correct answer: C. First ionisation energy increases along the period. Along the period Z increases which outweighs the shielding effect

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