Matter » Atoms » Electron configuration
Electron Configuration
The following rules of Bohr and Bury Scheme specify the distribution of electrons in various orbits. The shells are lettered from the innermost to outwards from K to Q.
- The maximum number of electrons that can occupy a given orbit is given by a formula 2n2, where n = orbit number.
For example 3rd shell ‘M’ can occupy
= 2 x n2
= 2 x 32
= 18 electrons
- The outermost orbit can have maximum 8 electrons, and the next inner to the outermost (penultimate) can have maximum 18 electrons, (if permissible, in accordance with rule 1).
- It is not always necessary to fill up an orbit completely before starting the next higher orbit.
ATOM SHELL STRUCTURE
ELECTRON CONFIGURATION TABLE