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Inside the atom — Rutherford's nucleus, Bohr's orbits and the light they emit.
Why do atoms only emit certain colours? Fire alpha particles at a nucleus to rebuild Rutherford's scattering experiment, drop electrons between Bohr's quantised energy levels and watch each jump release a photon of a definite wavelength, sort the hydrogen spectral series with the Rydberg formula, and see the Franck–Hertz experiment prove energy levels are discrete — the quantum structure of the atom, assembled piece by piece.
Beyond the open showcase, subscribed schools get the growing library of Atoms & Spectra experiments — searchable, tagged by concept and difficulty, and expanding continuously.