Assertion: Boron has a smaller first ionisation enthalpy than beryllium.
Reason: The penetration of a `2s` electron to the nucleus is more than the `2p` electron, hence `2p` electorn is more shielded by the inner core of electrons than the 2s electrons.

Statement-1: Boron has a smaller first ionisation enthalpy than beryllium. Statement-2: The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons.

B has a smaller first ionization enthalpy than Be. Consider the following statements (i) it is easier to remove 2p electron than 2s electron (ii) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be (iii) 2s electron has more penetration power than 2p electron (iv) atomic radius of B is more than Be (atomic number B= 5, Be = 4) The correct statements are

B has a smaller first ionization enthalpy than Be. Consider the following statements (i) it is easier to remove 2p electron than 2s electron (ii) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be (iii) 2s electron has more penetration power than 2p electron (iv) atomic radius of B is more than Be (atomic number B= 5, Be = 4) The correct statements are

Al has a smaller first ionization enthalpy than Mg. Consider the following statements : I. It is easier to remove 3p electron than 3s electron . II . 3p electron of Al is more shielded from the nucleus by the inner coreof electron than the 3s electrons of Mg III. 3s electron hasmore penetration power than 3p electron IV. Atomic radius of Al is more than Mg ( atomic number Al=13, Mg = 12 ) The correct statements are :

Al has a smaller first ionization enthalpy than Mg. Consider the following statements : I. It is easier to remove 3p electron than 3s electron . II . 3p electron of Al is more shielded from the nucleus by the inner coreof electron than the 3s electrons of Mg III. 3s electron hasmore penetration power than 3p electron IV. Atomic radius of Al is more than Mg ( atomic number Al=13, Mg = 12 ) The correct statements are :

np electrons are more penetrating than ns electrons.

The first ionisation energy of beryllium is more than that of boron because

The inner electrons are shielded to a "______" extent than the outer electrons.