It depends which type it is. It can be Uranium or Plutonium
The main element of nuclear bombs are a substance named Plutonium. Actually, I don't know how they found this material. (At least I got you the answer, right?)
It can.
The weapon was developed by the Manhattan Project during World War II. It derived its explosive power from the nuclear fission of uranium 235.
No, it is perfectly legal as long as it is used on your own property.
A single 1 MTon bomb will do it, or four 250 KTon bombs, or a thousand 1 KTon bombs, etc. However more smaller bombs can spread the damage wider than one large bomb.
During World War 2 they set them off to test them, and to make Japan surrender unconditionally.
plutonium
How to make nuclear bombs was solved over half a century ago.
It can.
Nuclear bombs are so powerful, and release so much radioactive fallout, that any large-scale use of nuclear bombs would kill everbody and make the world uninhabitable.
yes
There's no such thing as a bad element. Take arsenic, for instance. It is very poisonous so you might call it a bad element. But you can't make silicon chips or LEDs without arsenic, so it's a good element. Plutonium is another one. They make nuclear bombs out of it. Bad element? Not if you're fueling your nuclear reactor with it and powering a city with the electricity.
The weapon was developed by the Manhattan Project during World War II. It derived its explosive power from the nuclear fission of uranium 235.
The nuclear material used to make the bombs was from Oak Ridge TN
Countries want them, countries make the laws.
nuclear bomb = plutonium + weapon
Generally, no. But nations capable of making nuclear power plants may be able to extend the technology to make weapons.
Uranium makes for an excellent element for nuclear fission. Hydrogen is most commonly used for nuclear fusion.