That depends on the nuclear decay type. For gamma decay, the identity does NOT change, but for alpha and beta, it does.
The kWh produced by nuclear energy is the cheapest. It is a clean energy that does not pollute the environment. It gives chance for people to work during its construction and operation. It is reliable source of energy.
During President Clinton's term, international inspectors were not allowed to look at North Korean sites where nuclear waste was being dumped because the North Koreans did not want people to know what was going on. That country continues to keep much of their nuclear capability a secret from the rest of the world.
No.
Copper-67 undergoes beta decay with a halflife of 59 hours, becoming stable Zinc-67.
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During nuclear decay, radioisotopes of one element can change into one or more isotopes of a different element altogether.
"Substance" is too fuzzy a word. Chemical reactions can change materials into other compounds, for example shiny iron into rust (Fe2O3). But it cannot change an element into another element. A nuclear reaction can do that, for example uranium into plutonium.
Plutonium, an element not found in nature, is formed from uranium during reactor operation
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Hydrogen isotopes(12H) and the element formed is helium(24He).
New elements(or isotopes of decaying element) are produced and energy is released
According to Dalton's atomic theory chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction (it is possible only during nuclear reactions and radioactive disintegration).
Then there is a release of vast amounts of energy.
Elements are created that differ from the reactants.
During chemical reactions atoms remain unchanged.
Plutonium was discovered in 1940 during studies about nuclear physics, nuclear reactions, isotopes; normal and intelligent humans want to know more and more.