<Tr> <Td> Bismuth Bi </Td> <Td> Bi </Td> </Tr> <Tr> <Td> Copper Cu </Td> <Td> Cu </Td> </Tr> <Tr> <Td> Tungsten W </Td> <Td> </Td> </Tr> <Tr> <Td> Mercury Hg </Td> <Td> Hg </Td> </Tr>

List the metals fe sn zn al and cu in order of increasing activity (least to highest)