Ground-state → element is in its lowest energy form
Excited-state → an electron is at a higher energy level than its ground state
1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p
• 5s is lower in energy than 4d
• 5s should be filled first before 4d
• 4s should be fully filled first before moving to another orbital (3d)
Sort the following electron configurations of neutral atoms based on whether they represent an excited state configuration or a ground state configuration.
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