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Br-. Bromine will grab an electron to make itself more stable, which makes it a negative ion.
neg 1 bromide ion
No, Methane (CH4) is not a polyatomic ion. It doesn't have a charge, therefore it can't be an ion. It's considered a hydrocarbon.
This just means it has a charge of 1+. The Boron ion can only have a charge of 1+.
Cation = negative ion