You are probably thinking of changes to a nucleus in nuclear reactions. This can be during radioactive decay, a nucleus emitting an alpha or beta particle is transmuted to another nucleus which defines it as a different element. Also during nuclear fission the nuclei of uranium or plutonium are split up and hence become other elements
In nuclear reactions the atom itself changes while molecules and/or structural organisation of atoms do in chemical and physical changes.
In nuclear changes.
This is related to the large forces between nucleons.
The two processes that produce nuclear changes are nuclear fusion and nuclear fission. Nuclear fusion involves combining two atomic nuclei to form a heavier nucleus, while nuclear fission involves splitting a heavy nucleus into smaller ones. Both processes release a large amount of energy.
Nuclear reactions release significantly more energy than chemical reactions. Nuclear reactions involve changes in the nucleus of an atom and release energy from the strong nuclear force. In contrast, chemical reactions involve changes in the electron configuration of atoms and release energy from the weaker electromagnetic force.
In nuclear reactions the atom itself changes while molecules and/or structural organisation of atoms do in chemical and physical changes.
Nuclear energy comes from changes in an atom's nucleus, such as nuclear fission or fusion reactions. These processes release large amounts of energy in the form of heat and radiation.
In nuclear changes.
Chromatin
Heat from the nuclear reaction changes water to steam.
nuclear reaction
nuclear energy
And I believe this belongs in "nuclear physics," and I should know, I'm nuclear.
transmutation - same as the alchemists called it.
This is related to the large forces between nucleons.
The two processes that produce nuclear changes are nuclear fusion and nuclear fission. Nuclear fusion involves combining two atomic nuclei to form a heavier nucleus, while nuclear fission involves splitting a heavy nucleus into smaller ones. Both processes release a large amount of energy.
Nuclear reactor kinetics is the branch of reactor engineering and reactor physics and control that deals with long term time changes in reactor fuel and nuclear reactors.