Among the statements (I-IV), the correct ones are:

(I) Be has smaller atomic radius compared to $\mathrm{M}\mathrm{g}$   .

(II) Be has higher ionization enthalpy than Al.

(III) Charge/radius ratio of $\mathrm{B}\mathrm{e}$ is greater than that of $\mathrm{A}\mathrm{l}$ .

(IV) Both Be and Al form mainly covalent compounds.

<p>Charge / radius ratio of <span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">B</mi> <mi mathvariant="normal">e</mi> </math> </span> and <span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">A</mi> <mi mathvariant="normal">l</mi> </math> </span>is same because of diagonal relationship. Remaining statements are correct.</p>

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