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  • In comparison to boron, beryllium has -  Option: 1 lesser nuclear charge and lesser first ionisation enthalpy.  <br

In comparison to boron, beryllium has -
 

Option: 1

lesser nuclear charge and lesser first ionisation enthalpy.
 


Option: 2

greater nuclear charge and lesser first ionisation enthalpy
 


Option: 3

lesser nuclear charge and greater first ionisation entropy.
 


Option: 4

None of above.


Answers (1)

best_answer

In comparison to boron, beryllium has lesser nuclear charge and greater first ionisation enthalpy.
Electronic configuration of \mathrm{\mathrm{Be}(4)=1 s^2 2 s^2}
It posses completely filled s-crobitals. Hence, high amount of energy is required to pull the electron from the gaseous atom. Beryllium  (4) lies left to the boron (5) and on moving from lift to right an electron is added due to which nuclear charges increase from \mathrm{\mathrm{Be}\: to \: B}

Hence option 3 is correct.

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manish

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