Plz help me chapter structure of matter

Dear student,

1) Key highlights of the nuclear model of the atom are as follows

1. The nucleus is situated in the center of the atom and all protons are present in the nucleus.
2. Electrons reside outside the nucleus and revolve in defined orbits.
3. The size of the nucleus is 10⁵ times smaller than an atom.
4. Mass of electron is negligible as compared to proton so all mass is concentrated in the nucleus.

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