Question

9cw1
stable electron configurations are likely to contain
○ filled energy sublevels.
○ unfilled s orbitals.
○ fewer electrons than unstable configurations.
○ electrons with a clockwise spin.

Explanation:

Atoms strive for stability. Filled energy sublevels (like noble - gas configurations) provide maximum stability as they follow the octet rule (or duet rule for small atoms). Unfilled s - orbitals would make the configuration less stable. The number of electrons (compared to unstable configurations) isn't a general rule for stability (e.g., a sodium ion has fewer electrons than a sodium atom but stability is due to configuration, not just electron count). Electron spin direction (clockwise or counter - clockwise) doesn't determine overall configuration stability.

Answer:

filled energy sublevels.