2. The values of Z andlor N for a nucleus, which shows significant departure from the average behaviour by being unusually stable are called ..... (magic numbers) 3. Why is the nuclear model called a model not a theory? 4. Why are there no magic numbers that are odd? 5. Why do most nuclei obey j - j coupling where as most atoms obey L- S coupling? 6. What fundamental law of physics is most responsible for the existence of nuclear magic number? 7. Why are the atomic magic numbers different from the nuclear magic numbers? 8. Is it true that the nuclear magnetic dipole moment is due entirely to the singly odd nucleon and all the other nucleons are paired off with total magnetic dipole moments that cancel strictly? (N0) 9. In nuclear physics the word spin frequently refers to the ..... . in contrast to atomic physics where the word refers to the intrinsic spin angular momentum only. (total nuclear angular momentum quantum number I) 10. Spin-orbit spliting in atoms is a small effect giving rise to the ...... . In nuclei spin-orbit interaction is strong and gives rise to energy ...... . (ne structure, splitting) 1. In the nuclei the energy of the j = I + ll2 orbit is lower than that of the j = I 1I2 orbit. Is it same in case of atoms? - - (No. it is just opposite of what is found in atoms)