Elements of Group 1 and 2 — Chemistry STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryElements of Group 1 and 23 Marks
Question
Why is lithium iodide most covalent in nature among alkali halides?
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Answer
Among the alkali metal ions, $Li^+$ ion is the smallest cation while among halides, anion $I^–$ has the largest size.
Thus, electron cloud around $I^–$ ion is easily distorted by $Li^+$ ion leading to polarisation of anion and covalency.
Also, the difference in electronegativities of $Li $ and $I $ is small.Hence, lithium iodide is most covalent in nature among alkali halides.
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