Species which is least likely to exist is
[Be(OH)472-
BeF -
O A1F:-
O [Al(OH)]
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The species is least likely to exist is BeF6⁴–
- Be belongs to the first member of the Beryllium family , and it's group and period no. is 2 . As , we know that first atom of the group is small in size and don't have low lying vacant d orbital because of this they can't expand their covalency .
- Covalency is the number of electronpairs an atom can share with other atoms. The total number of orbitals available in the valence shell is known as covalency.
- The electronic configuration of Be is 1s² 2s² .In Be total electron present is 4. So , in Be it's maximum covalency is upto 4 and it can't expand it's octet.
- As , it doesn't contain vacant low lying d- orbitals so it can't expand it's co-ordination number beyond 4 .
- Due to this species like BeF6⁴- doesn't exist.As in this the maximum covalency of Be is 6 which can't be possible.
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