Electron shell
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In atomic physics, an electron shell is a group of atomic orbitals with the same value of the principal quantum number n. Electron shells make up the electron configuration of an atom. It can be shown that the number of electrons that can reside in a shell is equal to 2n2. The existence of electron shells was first observed experimentally in Henry Moseley's X-ray absorption studies. He labelled them with the letters K, L, M, etc. These letters were later found to correspond to the n-values 1, 2, 3, etc. They are used in the spectroscopic Siegbahn notation.
The name originates from the Bohr model, in which groups of electrons were believed to orbit the nucleus at certain distances, so that their orbits formed "shells".
References
- Tipler, Paul & Ralph Llewellyn (2003). Modern Physics (4th ed.). New York: W. H. Freeman and Company. ISBN 0-7167-4345-0ar:غلاف إلكتروني
