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To find the charge to mass ratio (specific charge) of an atom, you have to find both the charge of the nucleus and the mass of the nucleus

charge of nucleus = proton number x charge of 1 proton (1.6x10^-19)

mass of nucleus = nucleon number x mass of 1 proton (1.67x10^-27)

the you have to divide the charge of the nucleus by he mass of nucleus e.g Q/M

the answer should be in C/kg or Ckg^-1

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