Question

Diagonal relationship is shown between:

• A. $C$ and $N$
• B. $B$ and $Mg$
• C. $B$ and $Si$
• D. $Be$ and $Al$

Answer 1

The correct option is D $Be$ and $Al$

$Be$ and $Al$ have a similar size. The charge/size ratio of their ions is also very similar. Both the elements, thus have various similar properties. Thus it is said that $Be$ and $Al$ have the diagonal relationship. The other options do not have any such relationship.

Hence, the correct option is $\text{D}$