In both fission and fusion, MASS is converted into energy
Explanation:
In fission, heavier atoms are split into lighter atoms with the release of high energy radiation (mostly neutrons). With fission, heavier atoms are formed from lighter atoms, again with the release of high energy radiation mostly neutrons.
In both cases, unlike in chemical reaction where mass is conserved (reactants and product weight the same), in radioactive reactions, the mass of the reactants and products is not the same since some of the mass is converted to energy. In the process there will be a loss of gain of atomic particles hence atomic mass too. It observes the Einstein theory of E=mc² where mass and energy are inversely proportional.
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