(a) Show that the mass M of an atom is given approximately by Mapp = Amp, where A is the mass number and mp the proton mass. For

(b) 1H,

(c) 31P,

(d) 120Sn,

(e) 197Au, and

(f) 239Pu, use the mass values given in Table to find the percentage deviation between Mapp and M: percentage deviation = Mapp ?? M / M x 100

(g) Is a value of Mapp, accurate enough to be used in a calculation of a nuclear binding energy?

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Some Properties of Selected Nuclides Mass Binding Energy (MeV/nucleon) Spin Nuclide Stability (u) 'H 99.985% 1.007 825 "Li 92.5% 7.016 004 4 5.60 IS 16 31 100% 30.973 762 8.48 Kr 36 57.0% 83.911 507 8.72 48 84 50 70 120 32.4% 119.902 197 8.51 ASGd 157 64 93 15.7% 156.923 957 8.21 147 Au 196,966 552 79 118 197 100% 7.91 227Ac 227,027 747 138 227 21.8 y 7.65 89 24 100 y 7.56 94 145 239 239.052 157