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# What is the electronic configuration of potassium?A. $1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}$B. $[Ar]4{{s}^{1}}$C. $1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}4{{s}^{2}}3{{d}^{1}}$D. $3{{s}^{2}}4{{s}^{2}}4{{p}^{3}}$

Last updated date: 16th Sep 2024
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Hint: Electronic configuration tells us about the distribution of electrons of an atom or molecule in atomic or molecular orbitals. Electronic configuration was first discovered through the Bohr model of the atom which generally describes shells and subshells.

1. Aufbau principle: It states that electrons fill lowest atomic orbitals first after their completion and it moves towards higher level atomic orbitals. The subshell ordering according to this rule is given by: $1s,2s,2p,3s,3p,4s,3d,4p,5s,4d,5p,6s,4f,5d,6p,7s,5f,6d,7p,8s,5g......$
Potassium is the chemical element represented by $K$ and atomic number of potassium is 19. So its electronic configuration is based on above three rules and given as $1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}4{{s}^{1}}$ and can also be written as $[Ar]4{{s}^{1}}$ where $Ar$ represents argon having atomic number 18 and have electronic configuration$1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}$.