has a smaller first ionization enthalpy than . Consider the following statements:
(i) It is easier to remove an electron from than .
(ii) electron of is more shielded from the nucleus by the inner core of electrons than the electron of
(iii) electron has more penetration power than electron.
(iv)The atomic radius of Boron is more than.
The explanation for the correct option:
:
:
The penetrating power order: .
The shielding power order: .
Hence have high shielding power compared to the .thus electron can easily be removed from orbital. It is easier to remove an electron than an electron.
The explanation for the incorrect options:
As we move along the period, the size decreases, as increases. Hence the radius of B is smaller than the radius of Be.
Thus, option (A) is correct.