<Tr> <Th> 7 </Th> <Td> Roentgenium (Rg) 111 unknown chemical properties </Td> </Tr> <Tr> <Td_colspan="2"> Legend <Table> <Tr> <Td> primordial element </Td> </Tr> <Tr> <Td> synthetic element </Td> </Tr> <Tr> <Td> Atomic number color: </Td> </Tr> <Tr> <Td> black = solid </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td> primordial element </Td> </Tr> <Tr> <Td> synthetic element </Td> </Tr> <Tr> <Td> Atomic number color: </Td> </Tr> <Tr> <Td> black = solid </Td> </Tr> </Table> <Tr> <Td> primordial element </Td> </Tr>

Where is mercury located on the periodic table