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boron group element

any of the five chemical elements constituting Group IIIa of the periodic table (see ). The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). They are characterized as a group by having three electrons in the outermost parts of their atomic structure. Boron, the lightest of these elements, is a nonmetal but the other members of the group are silvery-white metals

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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