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Why boron does not form B^(3+) ion?...

Why boron does not form `B^(3+)` ion?

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Boron has three electrons in the valence shell, because of its small size and high sum of the first three ionization enthalpies `(.e. IE_(1)+IE_(2)+1E_(3))` , boron does not lose all its valence electrons to form `B^(3+)` ions.
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