Electron Configurations

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The distribution of electrons in various shells, sub-shells and orbitals of an atom is called its “electronic configuration.
 
Representation
  • The electronic configuration of an atom is written in terms of “nlx”:-notation where “l” indicates the subshell as given below:
Value of “l”       0       1       2       3
Sub-shell       s       p       d       f
Rules for writing electron configuration:
Formula= 2n2 (max no. in a shell)
  • The maximum No. of Electrons in 1st shell =2 * 12=2
  • The ‘’     ‘’     ‘’     ‘’     ‘’ 2nd shell= 2* 22=8
  • The ‘’     ‘’     ‘’     ‘’     ‘’ 3rd shell= 2* 32=18
  • The ‘’     “     ‘’     ‘’     ‘’ 4th shell= 2* 42=32
Electrons in a Sub shell = 2(2l + 1), where l=0,1,2,3 for s,p,d &f respectively.
  • Value of l                                :     0     1     2     3

  • Sub-shell                                 :     s     p     d     f
    Max.No. of Electrons              :     2     6     10     14

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