Verified Solution • 2025–26 Session
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QJEEM19Ch4ff5: JEE Main 2019 Chemistry - Class 11 JEEM19Ch4ff5 Solution: In comparison to boron, berylium has :
In comparison to boron, berylium has :
Multiple Choice Options
- A lesser nuclear charge and greater first ionisation enthalpy
- B greater nuclear charge and greater first ionisation enthalpy
- C greater nuclear charge and lesser first ionisation enthalpy
- D lesser nuclear charge and lesser first ionisation ethalpy
Step-by-Step Verified Solution
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.