Question

$Be$ shows diagonal relationship with:

• A. $B$
• B. $Mg$
• C. $Al$
• D. $Ga$

Answer 1

The correct option is C $Al$

Option $\left(C\right)$ is correct.

$Be$ shows diagonal relationship with $Al$. They both have nearly equal electronegativity, small size and availability of only four orbitals in the valence shell. They both form amphoteric oxides and dimeric halides.