<Tr> <Th> Element category </Th> <Td> transition metal </Td> </Tr> <Tr> <Th> Electron configuration </Th> <Td> (Ar) 3d 4s </Td> </Tr> <Tr> <Th> Electrons per shell </Th> <Td> 2, 8, 13, 2 </Td> </Tr> <Tr> <Th_colspan="2"> Physical properties </Th> </Tr>

In which of the following does manganese have the highest oxidation number