1952, Ivy Mike test shot 10MT.
No, the hydrogen fusion bomb was not developed until 1952. The first nuclear weapons were developed and used in combat in 1945.
Same as all elements - in stars by nuclear fusion.
It has not been developed enough to make this clear
Nuclear fission is the method currently used for generating energy, while nuclear fusion is still being developed for practical use.
The first nuclear weapons were developed in the united States under the Manhattan Proyect which made the first nuclear bombs.
Fission. Fusion has never been used on Earth, except for nuclear weapon tests.
Nuclear Fusion
Fusion is a nuclear reaction.
Nuclear weapons developed by the Manhattan project for the Allies were Fission weapons called Atomic bombs. Large scale Fusion weapons developed by Hungarian Edward Teller in USA after WW2 were called Hydrogen Bombs. However during 1942 the Nazis developed a hybrid fusion boosted fission weapon, in which hollow charge explosives were used to cause a plasma pinch, a kind of flash of neutrons to ignite a Fission explosion.
Nuclear fusion produces nuclear energy
The first work on nuclear fusion was performed in 1933 by Ernest Rutherford. The first nuclear fusion "reactor" was built in 1947 by teams in the UK and USSR. To this day no nuclear fusion "reactor" has been able to produce more energy than had to be put into it to get the reaction started, despite many different experiments on many different designs.
It may be possible one day but it will be many years before fusion plants are developed.