Philip Ball looks at how a little-known paper by Niels Bohr demonstrates the turmoil in physics on the brink of quantum ...

Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from a very strange experience. Everyone at that time imagined the atom as a "plum pudding." That is ...

His model was a huge leap forward in making ... States to launch the Manhattan Project to develop the atomic bomb. Shortly after Bohr's return home, the German army occupied Denmark.

Bohr's 'solar system' model of the atom is the way that most ... However, there was still a difference between the atomic number of the atom and the atomic mass. Bohr and other scientists knew ...

We are at a critical time and supporting climate journalism is more important than ever. Science News and our parent organization, the Society for Science, need your help to strengthen ...

When an electron dropped from a high-energy orbit to a lower-energy one, it gave out light with an energy equal to the ...