<Tr> <Th> Atomic number (Z) </Th> <Td> 18 </Td> </Tr> <Tr> <Th> Group </Th> <Td> group 18 (noble gases) </Td> </Tr> <Tr> <Th> Period </Th> <Td> period 3 </Td> </Tr> <Tr> <Th> Element category </Th> <Td> noble gas </Td> </Tr>

Which group on the periodic table is radioactive