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AP Chemistry381 views·Updated Jul 21, 2026Introduction to Electron Configuration
Practice identifying ground-state electron configurations using the Aufbau principle, Hund's rule, and the Pauli exclusion principle.
Which of the following is the correct ground-state electron configuration for a neutral atom of Cobalt (Co, Z=27)?
- Which of the following is the correct ground-state electron configuration for a neutral atom of Cobalt (Co, Z=27)? — [Ar] 4s2 3d7
- An element has the ground-state electron configuration [Kr] 5s2 4d10 5p3. Which of the following identifies the element and the number of unpaired electrons in its ground state? — Antimony, 3 unpaired electrons
- Which of the following rules is violated if an electron configuration for a ground-state Carbon atom is written as 1s2 2s2 2p2 with both 2p electrons sharing the same m_l orbital and having opposite spins? — Hund's Rule
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