Which one of the following pairs has two magic numbers for closed nuclear shells?
(a)8, 10
(b)10, 20
(c)50,82
(d)82, 130
Answer
Answer: C ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
Nuclear magic numbers (closed shells) are 2, 8, 20, 28, 50, 82 and 126. In (a) 10 is not magic, in (b) 10 is not magic, and in (d) 130 is not magic (126 is). Only 50 and 82 are both magic numbers. Answer: (c).