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Flip and pair: problem with the model that solved it

Exercise and reference answers

Matching pairs
  1. A
    Scattering results
    B
    Rutherford
  2. A
    Atomic stability
    B
    Bohr
  3. A
    Line spectra
    B
    Bohr
  4. A
    Electrons in a positive cloud
    B
    Thomson

Explanation

Each failure drove the next model. Source: syllabus Physics, Ch 12 Atoms.
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