Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in

  • Option 1)

    exhibiting maximum covalency in compounds

  • Option 2)

    forming polymeric hydrides

  • Option 3)

    forming covalent halides

  • Option 4)

    exhibiting amphoteric nature in their oxides.

 

Answers (1)

As we learnt in

Diagonal relationship -

Similarity in properties between first element of a group and second element of the next group

- wherein

This is due to similarity in sizes of their ions, and charge / radius ratio

 

and 

 

 

Anomalous behavious beryllium -

1) Due to small atomic and ionic size

2) High ionisation energy

3) No vacant d-orbitals

4) High hydration energy

-

 

Due to diagonal relationship  Be and Al exhibit many similar properties but covalency of Be is 4 because it has an absence of d-orbital whereas, covalency of Al is up to 6 due to the presence of vacant d-orbital.

 


Option 1)

exhibiting maximum covalency in compounds

This option is correct.

Option 2)

forming polymeric hydrides

This option is incorrect.

Option 3)

forming covalent halides

This option is incorrect.

Option 4)

exhibiting amphoteric nature in their oxides.

This option is incorrect.

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