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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
80 is an integer. If you are asking for the Celsius equivalent of 80°F, then the answer is 26.555...°C
O2- is the symbol for the oxide ion, which is an oxygen atom that has gained two electrons. The oxide ion has a charge of -2.