JEE MAIN - Chemistry (2019 - 12th April Evening Slot - No. 6)
In comparison to boron, berylium has :
lesser nuclear charge and greater first ionisation enthalpy
greater nuclear charge and greater first ionisation enthalpy
greater nuclear charge and lesser first ionisation enthalpy
lesser nuclear charge and lesser first ionisation ethalpy
Explanation
Electronic configuration of Be(4) = 1s22s2
Electronic configuration of B(5) = 1s22s22p1
Removing electron from outer most shell of Be is harder compare to B, as for Be 2s orbital is full filled so it is stable therefore required more ionization enthalpy to remove an electron.
We know in a period from left to righ effective nuclear charge increases, so B will have more nuclear charge.
Electronic configuration of B(5) = 1s22s22p1
Removing electron from outer most shell of Be is harder compare to B, as for Be 2s orbital is full filled so it is stable therefore required more ionization enthalpy to remove an electron.
We know in a period from left to righ effective nuclear charge increases, so B will have more nuclear charge.
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