Q. 6.     Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Answers (1)

The Bohr and Bury scheme for the distribution of electrons in an atom is based on the following rules :
1. The maximum number of electrons which a shell can have is represented by 2n^2, where n is the quantum number of that particular energy shell. Thus, the maximum number of electrons in the first four shells are :
1st (K) shell 2 x 1^2 = 2
2nd (L) shell 2 x 2^2 = 8
3rd (M) shell 2 x 3^2 = 18
4th (N) shell 2 x 4^2 = 32

2. The outermost shell, which is also called valence shell, can have a maximum of 8 electrons.

3. If permitted by rule 1, The shell inner to the outermost shell (the second last shell ) can accommodate a maximum of 18 electrons.

4. Electrons are not taken in unless the inner shells are filled, i.e., the shells are filled in a step-wise manner.   

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