Class 9 Chemistry Structure of The Atom Arrangement of electrons in the atoms

Arrangement of electrons in the atoms

  • Bohr and Bury’s rules for writing the number of electrons in different shells:-
  1. The maximum number of electrons present in a shell is given by 2n2, where n is the orbit number or energy level index, n=1,2,3,…

The maximum number of electrons in different shells can be given as:-

K- Shell –n =1 -> 2n2=2 x (1)2 = 2electrons

L- Shell – n = 2 -> 2n2 = 2x (2)2 = 8 electrons

M- Shell – n = 3 -> 2n2 = 2x (3)2 = 18 electrons

N- Shell – n = 4 -> 2n2 = 2x (4)2 = 32 electrons

And so on

  1. The maximum number of electrons that can be accommodated in the outermost orbit is eight.
  2. Electrons are not accommodated in a given shell unless the inner shells are filled, i.e. the shells are filled in a stepwise manner.

Class_9_Chemistry_Structure_Of_Atom_Atomic_Structure

Schematic atomic structure of the first eighteen elements

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