Read Richard Rhodes books:
they designed them, built the infrastructure and tested them.
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
A nuclear weapon must be armed before it can be used. They are all built with safety mechanisms so they will not go off accidently or on impact after the crash of a delivery vehicle.
This nuclear weapon is called an atomic bomb or a nuclear bomb
Nuclear weapon detonations
If by "bomb" you mean a conventional explosive weapon, then the nuclear weapon is more powerful.
nuclear chemicals such as plutonium
NO
no
No. LLNL even tested several Uranium-Hydride bombs in the 1950s. Even though their computer models said the devices should explode, none gave a nuclear yield. One could use the waste from the reactor as a Radiological Weapon, but the reactor itself is not useful as a weapon.
the first nuclear weapon was issued in WW2 created by the americans in a chicargo squash court
plutonium + weapon