Question:
Among the statements (I - IV), the correct ones are :
(I) Be has smaller atomic radius compared to $\mathrm{Mg}$.
(II) Be has higher ionization enthalpy than $\mathrm{Al}$.
(III) Charge/radius ratio of Be is greater than that of Al:
(IV) Both Be and Al form mainly covalent compounds.
Correct Option: 1
Solution:
Charge/ radius ratio of Be and Al is same because of diagonal relationship. Remaining statements are correct.
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