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Boron has an oxidation number of +3. It will try to lose the three valence electrons that it has, so that it is stable. Electrons are negative, and removing them would make the oxidation number positive.

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15y ago
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11y ago

On the basis of electronegativity (B is 2.04, H is 2.2) B would be +3 (you would treat H as -1)

If you follow the rule H is always +1 except when bonded to a metal then as boron isn't a metal - you get the answer -5!

Oxidation numbers are a formalism-- use the rule you have been taught to get the "right" answer!

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10y ago

Boron is in group 13. Pure boron has zero oxidation number.It become +3 when an ion, HOWEVER because of the ions very small size it forms covalant bonds with other elemnts, (Fajans rules indicate a high degree of polarisation of other ions). For exampe BF3, BCl3 and B2O3 are all covalent compounds they are not ionic.

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11y ago

0 in the elemental form, +2 in its compounds.

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11y ago

Atomic boron has the oxidation number of 0.

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14y ago

+3

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Q: What is the oxidation number for the element boron?
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