# Basic AS level Physics

Calculate the mass of an ion that has a specific charge of 1.20x10^7 C kg^-1 and a negative charge of 3.2x10^-19 C.

Question: if the ion has a negative charge of 3.2x10^-19, isn't that -3.2x10^-19?! In which case the answer would be -2.67x10^-26 kg?! Is the use of the word negative in this question a bit misleading?

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Hello Dan.West Ham supporter here(don't take the mickey).You make an interesting point.Specific charge is a ratio and I dont recall having seen it given either a positive or negative label.Thinking about it,it might seem to be more instructive to do so.

Hi Dadface, it isn't actually the specific charge I'm concerned about, its the charge of the ion. Is 'a negative charge of 3.2x10^-19 C' the same as -3.2x10^-19 C?! In which case the answer would be -2.67x10^-26 kg?! Is the use of the word negative in this question just a bit misleading?

Thanks very much!

P.s. Just watching the Bolton game myself!

Yes it is the same and it is twice the charge of the electron.From its charge and mass it looks like it's an oxygen ion.