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The only two stable nuclides with more protons than neutrons are ¹1H and ³₂He. Why is Z 7 N so uncommon?

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(a) Which of the following nuclides are magic: 122Sn, 132Sn, 98Cd, 198Au, 208Pb? (b) Which, if any, are doubly magic?
2H is a loosely bound isotope of hydrogen. Calleddeuterium or heavy hydrogen, it is stable but relativelyrare—it is 0.015% of natural hydrogen. Note that deuteriumhas Z = N , which should tend to make it more tightlybound, but both are odd numbers. Calculate BE/A , thebinding energy per nucleon, for 2H and compare it with theapproximate value obtained from the graph in Figure.
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56 Fe is among the most tightly bound of all nuclides. Itis more than 90% of natural iron. Note that 56 Fe has evennumbers of both protons and neutrons. Calculate BE/A , thebinding energy per nucleon, for 56 Fe and compare it withthe approximate value obtained from the graph
b) What type of decay is happening in the equation below? State two of the conservation laws that apply and explain how they are satisfied 238 92 U 234 Th + 4 a 90 2 c) Use the graph below to calculate the half-life of Protactinium 234, explain how you got your answer. Half Life of Protactinium 234 50 40 30 20 10 222222° 80 70 60 Activity (Bq) 0 20 20 40 40 60 80 100 120 140 160 Time (seconds)