Some bombs are nuclear. But most bombs are not nuclear.
Nuclear bombs can use either nuclear fission or nuclear fusion as the primary mechanism of energy release. Most nuclear bombs in current arsenals rely on nuclear fission reactions, while thermonuclear bombs use a fission reaction to trigger a fusion reaction.
nuclear bombs
Uranium, plutonium or hydrogen.
They were made by the United States during WW2.
40,000
Nuclear bombs are made of highly enriched uranium or plutonium. These materials undergo a nuclear fission chain reaction, releasing enormous amounts of energy in the form of heat and radiation, resulting in a powerful explosion. Additionally, nuclear bombs contain conventional high explosive materials to trigger the nuclear reaction and amplify the blast.
To protect the country that made them or most countries use it to gain more protection of other contries or to threaten other countries. :)
Russia currently owns the biggest stockpile of nuclear weapons in the world. Also Russia made and detonated the biggest nuclear bomb in history called the Tsar bomb.
Never, at least not yet.
None, the US currently only refurbishes existing bombs.
The nuclear material used to make the bombs was from Oak Ridge TN