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Summaries the rules for writing of distribution of electrons in various shells for the first eighteen elements.
a. The maximum number of electrons present in a shell is given by the formula
Where, n is . n = 1, 2, 3, 4, etc. Therefore, the maximum number of electrons in different shells are as follows:
Energy levels | Shells | Electron capacity |
1 | K | |
2 | L | |
3 | M | |
4 | N |
b. The maximum number of electrons that can be accommodated in the outermost orbit is .
c. Electrons cannot fill in a given shell unless the inner shells are filled. In other words, the shells are gradually filled. The size of the nucleus is very small as compared to the atom.
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