Question:
The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:
The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:
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Ionisation enthalpy decreases down the group because of increasing atomic size and electron shielding.
Updated On: Sep 16, 2025
B & Ga
B & Tl
Ti & B
B & In
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The Correct Option is A
Solution and Explanation
- The ionisation enthalpy decreases as we move down a group.
Boron (B) has the highest ionisation enthalpy in Group 13, while Gallium (Ga) has the lowest due to the larger atomic radius and shielding effect as we move down the group.
Thus, the correct answer is (1).
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