The oxidation number of Mn in [MnO4]-2
Correct answer: C. +6
- A. +7
- B. -7
- C. +6
- D. -6
Explanation
Let x be the oxidation number of Mn. Now, we can set up an equation based on the sum of oxidation numbers: x+(−8)=−2. Solving for x: x−8=−2. Adding 8 to both sides: x=6. Therefore, the oxidation number of Mn in the polyatomic ion [MnO4 ]−2 is +6, therefore option C is correct.
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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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