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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
In comparison to boron, berylium has
  • A
    greater nuclear charge and greater first ionisation enthalpy
  • B
    lesser nuclear charge and lesser first ionisation enthalpy
  • C
    greater nuclear charge and lesser first ionisation enthalpy
  • ✓
    lesser nuclear charge and greater first ionisation enthalpy
✓

Answer

Correct option: D.
lesser nuclear charge and greater first ionisation enthalpy
d
Since boron has higher nuclear charge because it has greater atomic number and lower $1^{st}$ $I.E.$ then beryllium due to fully filled $s-$ orbital.

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