Chapter 95 of 2363 min read
Ionic and covalent bonds, Lewis structures
Why this is asked: Fajans' rules explain why some "ionic" compounds behave covalently: a small, highly charged cation next to a large, polarisable anion pulls electron density back toward itself, which is why AlCl₃ and BeCl₂ don't act like typical ionic solids. Octet exceptions — BF₃ incomplete, PCl₅/SF₆ expanded, NO odd-electron — are tested directly, not as a footnote.
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