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In comparison to boron, beryllium has:

1. lesser nuclear charge and greater first ionisation enthalpy
2. greater nuclear charge and greater first ionisation enthalpy
3. greater nuclear charge and lesser first ionisation enthalpy
4. lesser nuclear charge and lesser first ionisation enthalpy

Correct answer: lesser nuclear charge and greater first ionisation enthalpy

Solution

Beryllium has a greater nuclear charge than boron due to having more protons, but its first ionization enthalpy is higher because it has a smaller atomic radius and a more stable electron configuration, making it harder to remove an electron.

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