Why `2s^2` electron is difficult to remove than 2p electron ?

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

Assertion: F atom has less electron afffinity than Cl atom. Reason: Additional electrons are repelled more strongly by 3p electrons in Cl atom than by 2p electrons in F atom.

Statement-1 : F arom has a less negative electron gain enthalpy than Cl atom. Statement-2 : Additional electron is repelled more efficiently by 3p electron in Cl atom than by 2p electron in F atom.

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 :

Assertion (A) :F atom has less electron than CI^(Theta) atom Reason (R ) : Additional electrons are repelled more effectively by 3p electron in CI atom than by 2p electron in F atom