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This answer is corrected

B stands for Boron, atom number 5 in group 13 (metalloid element) and has 3 valence electrons (like aluminum) so a cation would have 3+ charge.

(Berillium (Be number 4, alkaline earth metal) has the 2+ion because it has 2 electrons on it's valence shell that it needs to share with a non-metal).

Look at the Periodic Table group 2. group 13

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10y ago

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