JEE Main 2015 Chemistry question
Which of the alkaline earth metal halides given below is essentially covalent in nature?
Answer: (1)
Solution
Apply Fajans' rules: covalent character increases as the cation becomes smaller and more highly charged, because a small cation polarises the anion strongly. is by far the smallest alkaline-earth cation (ionic radius pm against 100 pm for and 118 pm for )
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