Boron does not form B3+ ions whereas Al forms Al3+ ions. This is because

Due to small size of boron, the sum of its first three ionization enthalpies is very high. This prevents it to form +3 ions and forces it to form only covalent compounds. But as we move from B to Al, the sum of the first three ionization enthalpies of Al considerably decreases and is therefore able to form Al3+ ions.

Boron does not form B3+ ions whereas Al forms Al3+ ions. This is because

Due to small size of boron, the sum of its first three ionization enthalpies is very high. This prevents it to form +3 ions and forces it to form only covalent compounds. But as we move from B to Al, the sum of the first three ionization enthalpies of Al considerably decreases and is therefore able to form Al3+ ions.

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Boron does not form B³⁺ ions whereas Al forms Al³⁺ ions. This is because

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The sum of IE₁ + IE₂ + IE₃ of B is much higher than that of Al

The size of B atom is larger than that of Al

Both 1 and 2

The sum of IE₁ + IE₂ + IE₃ of Al is much higher than that of B

answer is B.

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Detailed Solution

Due to small size of boron, the sum of its first three ionization enthalpies is very high.
This prevents it to form +3 ions and forces it to form only covalent compounds.
But as we move from B to Al, the sum of the first three ionization enthalpies of Al considerably decreases and is therefore able to form Al³⁺ ions.

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