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The most tightly bound nucleus with a small number of constituents is ⁴He, a bound state of two protons and two neutrons. The mass of ⁴He is about 3731.4 c² MeV, the proton mass is 938.2 c² MeV, and the neutron mass is 939.5 c² MeV. What is the binding energy of the nucleus ⁴He?
1. 8.0 MeV
2. 66.6 MeV
3. Zero
4. 469.1 MeV
5. 93.95 MeV
6. 372.14 MeV
7. 1865.7 MeV
8. 24.0 MeV



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