Hi Adarsh,

I think your question is incomplete as you have not mentioned choices.

BTW, Beryllium shows a diagonal relationship with Aluminium  because:-

• Both metals have a tendency to form covalent compounds
• Both BeCl2 and AlCl3 act as a Lewis acids and are used as Friedel – Crafts catalyst.
• Both elements have same electronegativity and the polarising power
• Both BeCl2 and AlCl3 have chlorine bridged structures in the vapour phase.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!