What are some properties of the boron group?

Question

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Answer 1

Except for boron itself, which is a nonmetal, the elements of group IIIA are metals (aluminum, gallium, indium, thallium). Even boron in its elemental state is a hard gray material that might be mistaken for a metal.

The elements of group IIIA have a valence (number of bonds to atoms other elements) of three. There are exceptions. Thallium often has a valence of 1 as well as of 3. Boron often has a valence of 4 (bonds) because of filling the empty space in its octet from other species from outside.

As a group, the elements of the boron group decrease in electronegativity as one goes down the column.

Answer 2

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What are some properties of the boron group?
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