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Quantized orbits and energy levels of hydrogen.
Lyman, Balmer, Paschen series via the Rydberg formula.
Protons, neutrons, mass number A, atomic number Z, isotopes.
R ∝ A^(1/3); approximate constancy of nuclear density.
Δm·c² and the binding-energy-per-nucleon curve.
Alpha, beta, and gamma emission with conservation rules.
Exponential decay; T₁/₂ = ln2/λ; activity A = λN.
Heavy-nucleus splitting; chain reaction and energy release.
Light-nucleus combination; stellar energy source.
Controlled fission; moderators, control rods, medical uses.