Chemistry · Classification of Elements and Periodicity in Properties

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Boron has a smaller first ionization enthalpy than beryllium. Reason (R): The penetration of a \( 2s \)-electron to the nucleus is more than that of a \( 2p \)-electron, making the \( 2p \)-electron of boron more shielded from the inner core than the \( 2s \)-electron of beryllium. In the light of the above statements, choose the correct answer from the options given below:

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