<Tr> <Td> Chlorous acid </Td> <Td> HClO </Td> <Td> + 3 </Td> <Td> + 2.0 </Td> </Tr> <Tr> <Td> Chloric acid </Td> <Td> HClO </Td> <Td> + 5 </Td> <Td>--1.0 </Td> </Tr> <Tr> <Td> Perchloric acid </Td> <Td> HClO </Td> <Td> + 7 </Td> <Td>--10 </Td> </Tr> <P> The chemical effects of this increase in electronegativity can be seen both in the structures of oxides and halides and in the acidity of oxides and oxoacids . Hence CrO and Mn O are acidic oxides with low melting points, while Cr O is amphoteric and Mn O is a completely basic oxide . </P>

Linus pauling developed electronegativity values based on which of the following