JEE Main 20209 Jan, Morning shiftChemistryMediumClassification of Elements and Periodicity in Properties127× since 2002
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 :