Electron configurations could be for ground states and excited states. Which of the electron configurations below is compatible with a ground-state electron configuration?
- 1s¹2s¹
- 1s²2s¹
- 1s²2s²2p⁸
- 1s²2s²2p⁴3s¹
- 1s²2s²2p⁶3d¹