We come now to a new aspect of atoms: the existence of discrete energy states. Niels Bohr’s idea that atoms can possess only certain well-defined amounts of energy was a major development in our understanding of atoms. In 1911 Bohr, a young Dane who had just received his Ph.D. in physics from the University in Copenhagen, came to England to visit for a year. He worked for a while in J J. Thomson’s laboratory in Cambridge, and then in early 1912 Bohr transferred to Manchester to work with Rutherford. Inspired by Rutherford’s concept of the atomic nucleus, Bohr subsequently developed a nuclear model of the hydrogen atom that predicted the wavelengths emitted in the spectrum of atomic hydrogen. The agreement of his predictions with observations was startlingly good.
KeywordsAtomic Number Nuclear Charge Principal Quantum Number Rydberg Atom Mercury Atom
Unable to display preview. Download preview PDF.
- 3.H.G.J. Moseley, “The high-frequency spectra of the elements,” Phil. Mag. 26, 1024–1034(1913).Google Scholar