Radioactivity (14C= radioactive, 12C= not radioactive)
Neutron number (isotopes)

Difference between carbon atoms and Uranium atoms
Half-life- carbon have shorter half-life compared to Uranium
Uses- carbon are commonly found in life form while Uranium is found in nuclear fission
Atomic Number- Carbon 6, Uranium 92

1) atomic mass is 14 for 14N and 15 for 15N
2)15N have one more neutron compared to 14N (Isotopes)
3) For both cases, the number of electrons and protons are the same. Since the no of electron mean same number of valence electron, they will have the similar chemical reaction

a) 94 protons
b) 93 =Neptunium
94 = Plutonim
c) 86 Protons

A: control rod assembly
B: cooling water out of the core
C:control rod
D cooling water into the core
E: Fuel rods