It was not discovered (technologies are never discovered).
Leo Szilard invented and patented it in London in 1934.
Fission of Uranium-235
In fact, it was not discovered, it was made that way. Robert Oppenheimer was named head scientist of the team that made the first nuclear bombs.
This was first discovered during the WW2 Manhattan Project to develop the A-bomb. The first reactor chain reaction was produced in 1942 in Chicago.
A nuclear bomb is any bomb with any nuclear or atomic material inside it, while a plutonium bomb is a specific type of nuclear bomb. Plutonium could be the nuclear material inside the bomb, and if it is, it's a plutonium bomb.
The best nuclear bomb is the Tsar bomba
Germany has not made a nuclear bomb.
Robert Oppenheimer is the father of nuclear bomb.
A nuclear bomb or atomic bomb
Atomic bombs are a type of Nuclear bomb and there are 2 types of nuclear bombs. The second type of nuclear bomb is a hydrogen bomb.
nuclear bomb
No president invented any nuclear bomb.
Plutonium+Weapons=Nuclear Bomb