Fission and fusion?
Have you considered consulting a dictionary or online encyclopedia?
Ahh, nevermind, Cecil already had one
I was right, fission and fusion
Nuclear=atomic=fission, usually. You could call a fusion bomb by both these names, as well.
Hydrogen = fusion.
To elaborate further on what Smeghead said:
Plus, to make things more confusing, all fusion weapons have a fission trigger, and high-yield weapons are three stage, fission-fusion-fission. The primary, or trigger, in a two- or three-stage thermonuclear device may also be boosted with tritium for a higher yield.
Here ya go: the binding energy per nucleon curve (scroll down a little bit for the graph).
(“Nucleon” is a generic name for either neutrons or protons – the particles that give an atom the lion’s share of its atomic mass).
At the peak of the graph is iron. It’s subatomic particles have the most “binding energy” per particle, meaning that it is the most tightly bound. In general, any change that causes subatomic particles to become more tightly bound will release energy.
What this translates to is that if you convert atom(s) on a low part of the curve (relative to the vertical axis), to atom(s) on a higher part of the curve, you get some energy. Said in another way, if you convert atoms that are far in mass from iron to atoms that are closer in mass to iron, you get energy out.
Reactions that combine atoms to make heavier atoms are fusion; these can be plotted on the graph as movement from left to right since the horizontal axis measures atomic mass. Reactions that split heavier atoms into lighter atoms are fission; these can be seen as movement from right to left on the graph.
It boils down to this: If you can travel on the curve from a low spot to a high spot, you get energy out. As you can see, there is a huge amount of energy to be had by converting atoms on the far left to atoms closer to iron. This is fusion. There is a much smaller (but not insignificant) amount of energy to be had by converting very heavy things on the right to lighter elements that are closer to iron. This is fission.
Wow, [sup]62[/sup]Ni has the most binding energy. Always thought it was Iron. http://hyperphysics.phy-astr.gsu.edu/hbase/nucene/nucbin2.html#c1