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 ...

Atomic structure Atoms are made from protons ... elements according to their atomic size and other properties, atomic theory and atomic numbers, you'll also learn about isotopes and the properties ...