Niels Bohr

Niels Henrik David Bohr (7 October 1885 – 18 November 1962) was a Danish physicist whose work laid critical foundations for modern atomic theory and quantum mechanics by integrating empirical spectral data with quantized energy levels in atomic models.

Bohr's 1913 atomic model resolved inconsistencies in classical theory by positing that electrons in stable orbits do not radiate energy continuously, with transitions between discrete orbits emitting radiation of frequency corresponding to the energy difference, as described in his Nobel lecture. This framework explained hydrogen's emission spectrum and introduced quantization of angular momentum, marking a pivotal shift from classical to quantum descriptions of matter.

Niels Henrik David Bohr was born on 7 October 1885 in Copenhagen, Denmark, in the mansion of his maternal grandfather David Adler. His father, Christian Bohr, held a doctorate in physiology from 1880 and served as a professor at the University of Copenhagen, where he conducted research on blood circulation and respiration, earning two Nobel Prize nominations. His mother, Ellen Adler Bohr, came from a prominent Danish family involved in banking and politics, with Jewish heritage; she met Christian while attending one of his courses for female students, leading to their marriage.