Mass spectroscopyWatch this thread
"What charge do the ions in a mass spectrometer have?".
As for the charge; you can figure it out for yourself. What is on the horizontal axis on the spectrum, and what do the numbers mean?
Which exam board? I'm not sure, following the change in specs. but I'll bet they are all the same and I'll bet it'll say what the only charge you'll get in Qs on the spec.
Then the plates w/ a negative potential accelerate them
then the electromagnets deflect them, the extent of which depends upon their mass to charge ratio (m/z).
edit: as it's electrons blasted at them, which rips off electrons, it would be a positive charge.
Imagine +1, that means there's one more proton than electron.
Imagine -1, that means there's one more electron than proton.
Hence a gain of electrons means it has been reduced, as the no. has gone from 0 to -1.
But only the "Imagine +1, that means there's one more proton than electron." is relevant here, as the loss of electrons has caused this.
(And anyone else quote me if you think it is wrong.)
Ionisation (making them positive as electrons are taken off)
Deflection (with a magnetic field)
Those are the steps in chronological order.