If the bonding in [MnO4]- were 25% covalent and 75% ionic, what would be the charges on the Mn and O atoms? By applying Pauling's electroneutrality principle, redistribute the charge in [MnO4]- so that Mn has a resultant charge of +3. What are the charges on each O atom?

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Actinides

The elements in which the extra electron tends to enter the 5f-orbitals of (n–2)th main shell are considered 5f-block elements. They are also named actinides. Actinides include 15 elements, from atomic number 89 to 103.