Task 1: The atomic nucleus
1. Proton or neutron
2. 1.75 for hydrogen and to about 15 for uranium
3. Neutron
4. neutrino
5. A unit of length equal to 10-15 meters.
6. Strong force, weak force and gravity.
7. Equal numbers of protons and neutrons.
8. Protons and neutrons came into being first.
9. They were created inside stars.
10. Nuclear fusion only releases energy when elements are higher than what nuclear fusion produce certain isotopes of lighter elements.
11. 2,8,20,28, 50, 82, 126, 114 and 184
12. It lasts 3.7 minutes
13. Because the sequence of spherical magical numbers cannot be extended this way
14. Binding energy.
15. In the shell model for the nucleus, magic numbers are numbers of nucleons at which a shell is filled

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It ends with lead-206
8. It is produced in the upper atmosphere of earth due to cosmic rays and nitrogen
9. Half-life (t1/2) is the time it takes for a radioisotope to decay half its previous value

Task 3: Nuclear fission
1. 235U and 239Pu
2. neutrons
3. n
4. It means the nucleus will split into two halves. Uranium-235 is the most frequent example
5. Isotopes that can be split through fission.
6. Some neutrons impact the fuel nuclei and induce further fissions that will release more neutrons. When these freshly released neutrons outnumber the neutrons that escaped from the assembly, a sustained nuclear reaction will take place.
7. If an assembly is made entirely out of nuclear fuel it is known as critical mass.
8. It is a nuclear reactor capable of generating more fissile material than it consumes.
9. They are intended to produce heat for nuclear power.

Task 4: Nuclear fusion
1. The fusion of two nuclei with a lower masses than iron generally produces energy.
2. The fusion of nuclei heavier than iron absorbs energy.
3. Mark Oliphant in 1932
4. The collision of two nuclei produces the most energy
5. You have to get the nuclei so close to each other in order to break the repulsion force awnd combine