<Tr> <Td> Francium </Td> <Td> Radium </Td> <Td> Actinium </Td> <Td> Thorium </Td> <Td> Protactinium </Td> <Td> Uranium </Td> <Td> Neptunium </Td> <Td> Plutonium </Td> <Td> Americium </Td> <Td> Curium </Td> <Td> Berkelium </Td> <Td> Californium </Td> <Td> Einsteinium </Td> <Td> Fermium </Td> <Td> Mendelevium </Td> <Td> Nobelium </Td> <Td> Lawrencium </Td> <Td> Rutherfordium </Td> <Td> Dubnium </Td> <Td> Seaborgium </Td> <Td> Bohrium </Td> <Td> Hassium </Td> <Td> Meitnerium </Td> <Td> Darmstadtium </Td> <Td> Roentgenium </Td> <Td> Copernicium </Td> <Td> Nihonium </Td> <Td> Flerovium </Td> <Td> Moscovium </Td> <Td> Livermorium </Td> <Td> Tennessine </Td> <Td> Oganesson </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> IUPAC group number </Th> <Th> </Th> </Tr> <Tr> <Td> Name by element </Td> <Td> scandium group </Td> </Tr> <Tr> <Td> CAS group number (US, pattern A-B-A) </Td> <Td> IIIB </Td> </Tr> <Tr> <Td> old IUPAC number (Europe, pattern A-B) </Td> <Td> IIIA </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Th> IUPAC group number </Th> <Th> </Th> </Tr> <Tr> <Td> Name by element </Td> <Td> scandium group </Td> </Tr> <Tr> <Td> CAS group number (US, pattern A-B-A) </Td> <Td> IIIB </Td> </Tr> <Tr> <Td> old IUPAC number (Europe, pattern A-B) </Td> <Td> IIIA </Td> </Tr> </Table> <Tr> <Th> IUPAC group number </Th> <Th> </Th> </Tr>

Thallium is in group 3 of the periodic table