Electronic configuration of the atoms and ions


Element Symbol Atomic number Electronic configuration (or Electron arrangement) KLMN
Hydrogen H 1 1
Helium He 2 2
Lithium Li 3 2,1
Beryllium Be 4 2,2
Boron B 5 2,3
Carbon C 6 2,4
Nitrogen N 7 2,5
Oxygen O 8 2,6
Fluorine F 9 2,7
Neon Ne 10 2,8
Sodium Na 11 2,8,1
Magnesium Mg 12 2,8,2
Aluminium Al 13 2,8,3
Silicon Si 14 2,8,4
Phosphorus P 15 2,8,5
Sulphur S 16 2,8,6
Chlorine Cl 17 2,8,7
Argon Ar 18 2,8,8
Potassium K 19 2,8,8,1
Calcium Ca 20 2,8,8,2

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