Consider the following electron configurations to answer the questions that follow: \text { (i) } 18^{2} 2 s^{2} 2 p^{6} 3 s^{1} \text { (ii) } 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2}

2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} \text { (iii) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{1} \text { (iv) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4} \text { v) } 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{5} 8. The electron configuration belonging to the atom with the highestsecond ionization energy is