The hybridisation of Mn in hexacyano-manganate (II) is sp3d2. The number of unpaired electrons in it is:
Correct answer: A. 1
- A. 1
- B. 2
- C. 5
- D. 3
Explanation
The configuration of Mn is [Ar]d5. Thus it is expected to have 5 unpaired electrons. But the strong ligand CN- causes the pairing of electrons as shown in the image below. Thus, there is only one unpaired electron left.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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