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- Confused! kindly explain, Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in
- #S - Block Elements (Alkali and Alkaline Earth Metals)
- #Chemistry
- #Engineering
- #Joint Entrance Examination Main
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 and
exhibit many similar properties but covalency of
is 4 because it has an absence of d-orbital whereas, covalency of
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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