Tag: Periodic Trends
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Structure, Bonding and Periodic Trends: The USNCO Marks You Should Never Lose (2026)
Structure and bonding questions are the fastest marks on a chemistry olympiad paper, and the ones students quietly lose. The trends, the VSEPR routine and the drills that fix it.
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The USNCO Blind Spot: Inorganic and Descriptive Chemistry (2026)
Thermodynamics and organic get all the attention, but inorganic and descriptive chemistry is where AP and IB students lose marks fastest. Five blocks, decoded with worked reasoning.