Nuclear explosions happen for many reasons:
An uncontrolled chain reaction (fission reaction) occurs with uranium 238,
A fission reaction is where 1 large nucleus (centre of an atom) splits up into 2 or more smaller nuclei giving off neutrons. These neutrons then hit another nucleus changing it into smaller nuclei and so on. e.g. (chain reaction)
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When and what explosion? One of the nuclear test shots. If so which?Remember Chernobyl was not a nuclear explosion, it was a steam explosion and graphite fire.
There has never been a nuclear explosion in the state of Texas
The first ever nuclear explosion was a test in New Mexico in 1945
The test was codenamed Trinity, the device was codenamed Gadget.
Trinity - nuclear test - happened on 1945-07-16.