The electronic configurations of some atoms are given below, which of these should have the highest second ionization energy?
- A1s², 2s², 2p⁶, 3s²
- B1s², 2s², 2p⁶, 3s¹
- C1s², 2s², 2p⁶
- D1s², 2s², 2p⁵
✓ Correct answer: B
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