Answer:
1)NUCLEUS -> It is the center of an atom which contain protons and neutrons
SHELL-> the space where the probability of finding electrons is maximum in the atom is known as shell
there are mainly four shells KLMN
2)NUCLEUS->The average potential of Nuclei is different from that of an atom.
SHELL -> The average Potential varies.
3)NUCLEUS ->Particles of the shell structure of nuclei are neutrons and protons
SHELL->Particles of the shell structure of an atom are electrons
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