10/07/2026
Born on this day in 1885: Niels Bohr.
His 1913 atomic model reshaped how we understand matter by proposing that electrons travel in quantized ""stationary state"" orbits around the nucleus. This structure explained why atoms don't simply collapse. He later showed that an element's chemical properties are largely determined by the number of electrons in its outermost orbit, laying groundwork for our modern understanding of the periodic table.
For these contributions to atomic structure and quantum theory, Bohr received the 1922 Nobel Prize in Physics. Today, his ideas remain foundational to nuclear and atomic physics.