The covalent alkaline earth metal halide (X = | vedclass

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(A) Beryllium $(Be)$ has a very small atomic size and high ionization enthalpy compared to other alkaline earth metals. According to Fajans' rules,the

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$BeX_2$

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(A) Beryllium $(Be)$ has a very small atomic size and high ionization enthalpy compared to other alkaline earth metals. According to Fajans' rules,the small size and high charge density of the $Be^{2+}$ ion result in high polarizing power,which gives its halides $(BeX_2)$ a predominantly covalent character. Other alkaline earth metal halides are primarily ionic.

The covalent alkaline earth metal halide $(X = Cl, Br, I)$ is:

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