Birth
Niels Henrik David Bohr is born in Copenhagen, later becoming a central architect of atomic theory and twentieth-century quantum physics.
Historical biography archive · Updated 2026-11-03
Niels Henrik David Bohr Biography and Timeline
Follow Niels Henrik David Bohr through 55 dated historical records for Denmark.
Niels Henrik David Bohr, historical timeline
A chronological timeline drawn from matching World History Database records.
55Distinct records
1 of 2Page
1885–1936Years on this page
1885
1903
University Physics Studies Begin
Enters the University of Copenhagen to study physics, with mathematics, astronomy and chemistry as supporting subjects.
1906
Surface Tension Prize Essay Submitted
Submits an experimental study of water-jet surface tension to the Royal Danish Academy competition after conducting measurements in his father's laboratory.
1907
Royal Danish Academy Gold Medal
Receives the Royal Danish Academy gold medal for his experimental investigation of surface tension and liquid-jet vibrations.
1908
Surface Tension Paper Submitted
Prepares and submits his surface-tension research to the Royal Society, extending Rayleigh's treatment by accounting for viscosity, air and finite-amplitude oscillations.
1911
Cavendish Laboratory Research
Moves to Cambridge and works around J. J. Thomson's Cavendish Laboratory while continuing theoretical studies on electrons and atomic physics.
Doctoral Thesis on Electron Theory
Defends his doctoral thesis on the electron theory of metals, confronting limitations in classical electron theory and the implications of Planck's quantum ideas.
1912
Rutherford Laboratory Research
Joins Ernest Rutherford's laboratory in Manchester, where research on radioactive phenomena and the nuclear atom strongly redirects his theoretical work.
Quantum Analysis of Rutherford Atom
Begins applying quantum concepts to Rutherford's nuclear atom after recognising that a classical electron orbiting a nucleus would be unstable.
1913
Bohr Atomic Model
Publishes an atomic model with electrons occupying discrete energy states.
Charged Particle Stopping Theory
Publishes theoretical work on how moving charged particles lose velocity while passing through matter, developed from research undertaken in Rutherford's laboratory.
Constitution of Atoms and Molecules Trilogy
Publishes a three-part series on atomic and molecular constitution that integrates Rutherford's nucleus with quantum restrictions and extends the framework beyond hydrogen.
Copenhagen Physics Lectureship
Takes a lectureship in physics at the University of Copenhagen and continues developing the new quantum description of atomic structure.
Quantized Electron Orbits
Explains the hydrogen spectrum through quantum transitions between stationary orbits.
1914
Manchester Physics Lectureship
Accepts a physics lectureship at Victoria University of Manchester, maintaining close contact with Rutherford's influential nuclear-physics research community.
1916
Professor of Theoretical Physics
Is appointed professor of theoretical physics at the University of Copenhagen, giving him a permanent institutional base for atomic and quantum research.
1917
Theoretical Physics Institute Proposal
Submits a detailed application to the university science faculty seeking a dedicated institute for theoretical physics with stronger research and laboratory facilities.
1918
Correspondence Principle and Line Spectra
Develops the correspondence approach linking quantum transitions with classical frequencies, providing a bridge between older mechanics and emerging quantum descriptions of spectra.
Institute Proposal Reaches Parliament
Sees the proposal for a new theoretical physics institute placed before the Danish Parliament after private fundraising and university support advance the project.
1920
Quantum Periodic System Programme
Extends atomic theory toward the periodic system by relating electron configurations and quantum states to recurring chemical and spectroscopic properties.
1921
Copenhagen Physics Institute Opened
Creates an international centre for atomic and quantum research.
Institute for Theoretical Physics
Opens the University of Copenhagen institute devoted to theoretical physics.
1922
Atomic Structure Recognition
Gains recognition for applying quantum ideas to the structure of atoms.
Nobel Prize in Physics
Receives the physics prize for research on atomic structure and radiation.
Hafnium Discovery Confirms Prediction
Sees the discovery of hafnium by Dirk Coster and George de Hevesy support the placement of element 72 predicted from his atomic-structure theory.
Prediction of Element 72 Properties
Uses atomic theory to argue that element 72 should resemble zirconium rather than the rare-earth elements, directing attention toward zirconium-bearing minerals.
1924
Correspondence Principle Absorption Analysis
Publishes an extension of the correspondence principle relating quantum absorption and dispersion to the behaviour expected from classical multiply periodic orbits.
Bohr-Kramers-Slater Radiation Theory
Works with Hendrik Kramers and John Slater on a radiation theory using virtual oscillators and the correspondence principle to reconcile wave and quantum descriptions.
1926
Wave Mechanics Discussions with Schrodinger
Engages Erwin Schrodinger in intensive discussions over the physical interpretation of wave mechanics and its relationship to discontinuous quantum transitions.
1927
Complementarity Principle
Presents complementarity as a principle for interpreting quantum phenomena.
Quantum Measurement Interpretation
Argues that mutually exclusive experimental descriptions can both be necessary.
Einstein-Bohr Solvay Debate
Debates Albert Einstein at the Solvay Conference over the meaning and completeness of quantum mechanics, defending the role of experimental context in measurement.
1928
Quantum Postulate Paper
Publishes a major exposition of the quantum postulate and recent developments in atomic theory, formalising his interpretation of quantum phenomena.
1929
Copenhagen Physics Conferences Established
Institutionalises recurring Copenhagen conferences that bring leading and younger physicists together for informal discussion of unresolved problems in quantum and atomic physics.
1930
Second Solvay Debate with Einstein
Again confronts Einstein's thought experiments at the Solvay Conference, using detailed measurement arguments to defend quantum mechanics against challenges to its consistency.
1932
Institute Turns Toward Nuclear Physics
Redirects growing attention at his institute from electron structure toward the atomic nucleus as neutron discovery and accelerator experiments open a new research field.
1935
Radium Research Gift
Receives funds raised for half a gram of radium on his fiftieth birthday, strengthening experimental nuclear and radioactive research at his institute.
Response to Einstein-Podolsky-Rosen
Publishes a detailed response to the Einstein-Podolsky-Rosen argument, defending quantum mechanics and stressing that measurement arrangements define which physical quantities can meaningfully be specified.
1936
Compound Nucleus Model
Proposes that an incoming particle forms a temporary compound nucleus.
Nuclear Reaction Theory
Provides a framework for explaining many nuclear reactions and resonance effects.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.