Question:
Among the statements $(\mathrm{I}-\mathrm{IV})$, the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than $\mathrm{Al}$.
(III) Charge/radius ratio of Be is greater than that of $\mathrm{Al}$.
(IV) Both Be and Al form mainly covalent compounds.
Correct Option: , 3
Solution:
$\mathrm{I}, \mathrm{A}_{\mathrm{N}}: \mathrm{Be}<\mathrm{Mg}$
II IE : Be > Al
III Charge/radius ratio of Be w less than that of Al
IV Be, Al mainly form covalent compounds