Given below are two statements: Assertion A: The first ionisation enthalpy decreases across a period. Reason R: The increasing nuclear charge outweighs the shielding across the period.
- 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