(B) The given electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$. This configuration corresponds to the element Potassium ($K$,atomic number

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(B) The given electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$. This configuration corresponds to the element Potassium ($K$,atomic number $19$). Since the electrons are filled in the orbitals according to the Aufbau principle,Hund's rule,and Pauli's exclusion principle,this represents the stable ground state of the atom.