Atomic mass of 16 8O is found to be 16.0000u

Question

Atomic mass of ₈¹⁶O is found to be 16.0000u

1. what is the mass of ₈¹⁶O nucleus (Hint: mass of an electron = 0.00055u)

2. determine the total mass of the constituents particles of ₈¹⁶O the nuclei.

(Hint : Mass of neutron = 1.00864 u,

Mass of proton = 1.007274 u)

3. Give a general expression for mass defect and explain what is binding energy?

4. Binding energy per nucleon is lower for both very light nuclei (Z ≤ 10) and very heavy nuclei (Z ≥ 70) Justify a nuclear fission and fusion

Answer 1

1. Mass of nucleus = (8 × 1.00864 + 8 × 1.007274) amu.

2. (8 × 1.00864 + 8 × 1.007214 + 8 × 0.0055)amu

3. ∆m = [ZM_p + (A - Z) M_n – M)

4. When two light nuclei are combined to form a heavy nucleus, the binding per nucleon increases. Hence the stability of atom increases. When heavy nucleus split into two light nuclei; B.E. for nucleon also increases.