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2026 season is open · National Exam · April 10–19, 2026 · see the timeline →

Tag: Inorganic Chemistry

  • USNCO Coordination Chemistry: A Past-Exam Clinic for Isomer Counting

    Struggling with USNCO coordination isomer counting? This clinic gives a three-check diagnostic for ligand charge, coordination number/geometry and symmetry, worked teaching illustrations for cis/trans (octahedral MA4B2) and fac/mer (MA3B3), two further traps, and a reusable error-log template. All examples are teaching illustrations, not official contest questions.