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A nuclear weapon is a weapon which derives its destructive force from nuclear reactions of either nuclear fission or the more powerful fusion. As a result, even a nuclear weapon with a relatively small yield is significantly more powerful than the largest conventional explosives, and a single weapon can be capable of destroying or seriously disabling an entire city.

In the history of warfare, nuclear weapons have been used only twice, both during the closing days of World War II. The first event occurred on the morning of 6 August 1945, when the United States dropped a uranium gun-type device code-named "Little Boy" on the Japanese city of Hiroshima. The second event occurred three days later when a plutonium implosion-type device code-named "Fat Man" was dropped on the city of Nagasaki. The use of the weapons, which resulted in the immediate deaths of at least 120,000 individuals (mostly civilians) and about two times that number over time, was and remains controversial � critics charged that they were unnecessary acts of mass killing, while others claimed that they ultimately reduced casualties on both sides by hastening the end of the war. (See Atomic bombings of Hiroshima and Nagasaki for a full discussion.)

Since that time, nuclear weapons have been detonated on over two thousand occasions, mostly for testing purposes, chiefly by the United States, Soviet Union, United Kingdom, France, People's Republic of China, India and Pakistan. These countries are the declared nuclear powers (with Russia inheriting the weapons of the Soviet Union after its collapse).

Various other countries may hold nuclear weapons, but they have never publicly admitted possession, or their claims to possession have not been verified. For example, Israel has modern airborne delivery systems and appears to have an extensive nuclear program (see Israel and weapons of mass destruction); North Korea has recently stated that it has nuclear capabilities (although it has made several changing statements about the abandonment of its nuclear weapons programs, often dependent on the political climate at the time) and Iran was accused by a number of governments of attempting to develop nuclear capabilities, and now acknowledges that it is trying to obtain nuclear power, supposedly for peaceful purposes. South Africa is the only country to have developed an atomic bomb and then renounced possession of them (though several former Soviet Republics gave up their "inherited" nuclear arms after the breakup of the U.S.S.R.) For more information see List of countries with nuclear weapons.

Apart from their use as weapons, nuclear explosives have been proposed for various non-military uses.

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Q: What was the atomic bomb?
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Related questions

Is Pakistani bomb is an Islamic bomb?

If you consider the US atomic bomb is a Christian bomb, the French atomic bomb is also Christian bomb and so on, then you can name the Pakistani atomic bomb an Islamic bomb.


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The atomic bomb is an artefact, and so an invention. Maybe you meant to ask who invented the atomic bomb ?


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the atomic bomb was not discovered, it was invented then built.


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i think they're the same. the atomic bomb is a type of nuclear bomb


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The second atomic bomb, dropped on Nagasaki, was a Plutonium bomb.


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The atomic bomb was created by the United States.


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