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The general term is "nuclear reaction". An atom may emit alpha, beta, or gamma rays; it may split into two or three smaller parts (fission), or two lighter atoms may combine into a heavier one (fusion).
Uranium may suffer nuclear reactions, nuclear fission, nuclear decay.
I would say it is actually both. Fusion itself is a chemical reaction but it is powered by a physical feature named gravity.
Elements are created that differ from the reactants.
Nuclear fusion or nuclear fission.
Fusion or fission.
Phase change - melting, evaporation, Nuclear fusion or fission.
Both processes change the nature of the atom.
its a changw
The only way to change the number of protons in an atom is with a nuclear reaction.
Nuclear reactions change the composition of an atom's nucleus, hence nuclear reaction.
Nuclear reactors produce exactly one additional fission for each fission reaction while nuclear bombs don't Nuclear bombs are runaway fission reactions and reactors aren't (APEX)