Atoms and Nuclei
Class 12 Physics Atoms and Nuclei — Rutherford's nuclear atom and Bohr's model, hydrogen energy levels and spectral series, nuclear size and density, mass defect and binding energy, and radioactivity with the decay law, half-life, fission and fusion, fully solved with NCERT numericals.
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Atomic Models & Bohr's Theory
The story of the atom begins with Rutherford's nuclear model (1911). In his famous alpha-scattering experiment a thin gold foil was bombarded with -pa…
Start this topic → 2The Nucleus: Composition, Size & Binding Energy
The nucleus is the tiny, dense core of the atom. It is made of nucleons — protons (charge , mass ) and neutrons (no charge, mass ). The number of prot…
Start this topic → 3Radioactivity & Nuclear Reactions
Radioactivity , discovered by Becquerel in 1896, is the spontaneous disintegration of an unstable nucleus with the emission of radiation. Three kinds …
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40 marks • 90 min • with answer key