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Question

Boron differs from other IIIA group elements because of:

A
it has much lesser radius
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B
difference in the penultimate shell configuration.
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C
it is covalent in its compounds
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D
it is a non metal
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Solution

The correct options are
A it has much lesser radius
B difference in the penultimate shell configuration.
Boron differs from other IIIA group elements because of its small size (88 pm), higher elctronegativity (2.0) and higher value of ionization enthalpy (801 kJ/mol). The high value of ionization enthalpy is due to difference in the penultimate shell configuration.

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