The electronic configuration in the ground state of the chloride ion \(\left( Cl ^{-}\right)\)is
A. \(1 s ^{2} 2 s ^{2} 2 p ^{6} 3 s ^{2} 3 p ^{5}\) B. \(1 s ^{2} 2 s ^{2} 2 p ^{6} 3 s ^{2} 3 p ^{6}\) C. \(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{7}\) D. \(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 d^{8}\)
Correct Answer: B
Explanation
Chlorine \(( C l)\) has 17 electrons, \(Cl ^{-}\)has 18 electrons \(Cl +e^{-} \rightarrow Cl\) The electronic configuration of \(Cl ^{-}\)in the ground state is: \(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}\)
