The formation of stable polyhalides is a characteristic of larger alkali metals. Which of the follow — s Block Elements Chemistry Question
Question
The formation of stable polyhalides is a characteristic of larger alkali metals. Which of the following compounds is a known, stable polyhalide that contains ionic bonds between the metal and the polyhalide anion?
Answer: C
💡 Solution & Explanation
Heavy alkali metals like Caesium ($Cs$) can stabilize large polyhalide anions due to high lattice energy matching. $CsBr_3$ is an ionic compound existing as $Cs^+$ and the linear polyhalide anion $Br_3^-$. Small cations like $Li^+$ cannot stabilize these large anions.
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