Hi all, I am having trouble understanding how to calculate specific charge. I know that it is charge/mass. But what charge are they referring to? For instance an atom may be charged + or - and may not be charged at all. In that instance are we referring to the extra charge that exceeds the positive or negative charge? What is the specific charge of a U-238? Please show me some work outs. especially showing for charged and uncharged atoms. (assuming uncharged contains extra protons or electrons) ...or is it neutral atoms do not apply. Thank you.