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The exhibition of highest co-ordination dumber depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF63- ?(a) B(b) AI(c) Ga(d) In

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Boron as Co-ordination no of the central atom is supposed to be 6, while Boron being metalloid can't have co-ordination no greater than 4. Thus, Boron is the answer.
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Specialist in Chemistry.

Option a is correct because it can not extends it's orbitals to due lack of d orbitals
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(a) The element M in the complex ion MF63- has a coordination number of six. Since B has only s- and p-orbitals and no d – orbitals, therefore, at the maximum it can show a coordination number of 4. Thus, B cannot form complex of the type MF63-, i.e., option (a) is correct.
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