During nuclear decay, radioisotopes of one element can change into one or more isotopes of a different element altogether.
helium-4
Hydrogen isotopes(12H) and the element formed is helium(24He).
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.
It would become an atom of a different element. This can only happen during radioactive decay, nuclear fusion, or nuclear fission.
That depends on the nuclear decay type. For gamma decay, the identity does NOT change, but for alpha and beta, it does.
Certain fissionable materials, usually a uranium or plutonium isotope.
"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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helium-4
Hydrogen isotopes(12H) and the element formed is helium(24He).
Transmutation is a what happens when a cellular change occurs in an atom. This mutation will occur in an atom if it is unstable as a way to stabilize itself.
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.