Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Answer
The rules for writing of distribution of electrons in various shells of an atom are as follows:
- Based on the Bohr-Bury scheme, we know that the maximum number of electrons that can be present in a particular energy shell of an atom is given by 2n 2 , where “n” is the number of energy shells.
|
Shell Name |
Other Name |
Max No of Electrons |
|
K shell |
n=1 |
2 |
|
L Shell |
n=2 |
8 |
|
M Shell |
n=3 |
18 |
|
N Shell |
n=4 |
32 |
- The maximum number of electrons that can be accommodated in the outermost orbit is 8 (octet rule) .
- Electrons are not accommodated in a given shell, unless the inner shells are filled.
