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since Barium is a metal in group 2 of the Periodic Table, that means it has two electrons in its outer shell. Dont ask me why, it's how scientists arranged it, the atoms who have 2 valency electrons are grouped together, the ones with 3 are grouped together and so on..Anyway, Barium is a group 2 metal, which means when it reacts with a non-metal it will give away those two electrons to the non-metal. now you must know that the number of electrons are equal to the number of protons , right? well they are. so when it reacts and gives its electrons away, the atom becomes two electrons less AND the protons are more than the number of electrons by 2, so the atom becomes POSITIV by two!

Barium has 56 electrons and protons, so when it reacts, it looses the two valency electrons and gains the positive charge of +2!

so the final answer for your question is Ba+2

that wasnt so bad

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