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:
1
Both A and R are true and R is the correct explanation of A
2
A is true but R is false
3
A is false but R is true
4
Both A and R are true but R is NOT the correct explanation of A