Which journal published Bohr's three famous atomic-theory papers in 1913?

Philosophical Magazine published Niels Bohr’s three famous atomic-theory papers in 1913. Together, the papers are often called Bohr’s “trilogy” or “three-part memoir” on the constitution of atoms and molecules.

The papers appeared in July, September, and November 1913. Bohr used Ernest Rutherford’s nuclear atom as a starting point, then introduced quantum restrictions inspired by Max Planck. His model allowed electrons to occupy stable stationary states rather than continuously radiating energy as classical physics predicted.

Bohr also connected atomic transitions with spectral lines: light would be emitted or absorbed when an electron moved between allowed energy levels. This helped explain the regularities of hydrogen’s spectrum and made the model an important bridge between classical physics and modern quantum theory.

The title can cause confusion because Philosophical Magazine was a physics journal despite its broad-sounding name. The papers were not published in Nature, Physical Review, or Annalen der Physik, although those journals were also influential venues in early twentieth-century physics.