Question

Account for the fact that "although beryllium and aluminium belong to different groups in the periodic table,they resemble each other closely".

Answer 1

There is said to be a diagonal relationship between these elements.

There are several reasons for this, but each depends on the way atomic properties like electronegativity vary around the Periodic Table

Answer 2

"Although beryllium and aluminium belong to different groups in the periodic table,they resemble each other closely" because of their similar size.

Explanation:

Both beryllium and aluminium show diagonal relationship with each other. As beryllium leads to the formation of $Be^{2+}$ ion and aluminium leads to the formation of $Al^{3+}$ ion.

So, the size of both these ions is similar in nature and both these participate in the formation of covalent bonding also. Also, hydroxides of both beryllium and aluminium in the presence of excess alkali form their respective ions.

Learn more about diagonal relationship:

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