Which of the following sequences represents the correct "W-shaped" trend of the first ionization enthalpies for the Group 13 elements? | Periodic Table and Periodicity — Chem-Mantra | Chem-Mantra

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Question

Which of the following sequences represents the correct "W-shaped" trend of the first ionization enthalpies for the Group 13 elements?

Answer: B

💡 Solution & Explanation

Due to transition contraction ($Ga > Al$) and lanthanide contraction / inert pair effect ($Tl > In$), the irregular IE trend for Group 13 is $B > Tl > Ga > Al > In$.

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