Na+ has completely filled K and L shells. Explain.


Sodium is a member of the alkali metal family with lithium and potassium. Being one of the two elements in our table salt is its the biggest claim to fame.

  • Atomic number of sodium (Na) = 11
  • Number of electrons in sodium (Na) = 11

Electronic configuration of sodium [Na] = 1s2 2s2 2p6 4s1

Na+ ion has one electron less than Na atom i.e. it has 10 electrons. Therefore, 2 electrons go to K-shell and 8 electrons go to L-shell, thereby completely filling K and L shells.

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