I would suggest reading Richard Rhode's book "The Making Of The Atomic Bomb" first by Chuck Hansen's book "Swords Of Armageddon". They can cover it better than I can here.
Cca. 50 kg of highly enriched uranium. Now nuclear bombs use plutonium, not uranium.
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
These are the well defined - and just as easily assembled as they are dis-assembled - Nuclear Pore Assemblages.
No president invented any nuclear bomb.
That depends on how big the nuclear bomb is.
Plutonium+Weapons=Nuclear Bomb