How to find electronic configuration of elements by KLMN rule or by Bohr bury scheme?

The arrangement of electrons in the various shells/orbits/energy levels of an atom of the element is known as electronic configuration.
Bohr and Bury Scheme - Important Rules

Maximum number of electrons that can be accommodated in a shell is given by 2n2 where n=shell number
For 1st energy level, n = 1

Maximum number of electrons in 1st energy level = 2n2
2 x (1) 2 = 2
For 2nd energy level n=2
Maximum number of electrons in the 2nd energy level = 2n2

2 x 22 = 2 x 4 = 8
For 3rd energy level n=3

Maximum number of electrons in the 3rd energy level = 2n2
= 2x(3)2

= 2x9=18
For 4th energy level n=4

Maximum no.of electrons in the 4th energy level = 2n2
= 2x(4)2

= 2x16=32Sl No. Electron Shell Maximum capacity
1. K Shell 2 electrons
2. L Shell 8 electrons
3. M Shell 18 electrons
4. N Shell 32 electrons







The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has a capacity to accommodate more electrons. This is a very important rule and is also called the Octet rule. The presence of 8 electrons in the outermost shell makes the atom very stable. 

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