<Tr> <Td> Group 13 </Td> <Td> IIIB </Td> <Td> IIIA </Td> <Td> boron family </Td> <Td> triels </Td> <Td> triels from Greek tri (three, III) </Td> </Tr> <Tr> <Td> Group 14 </Td> <Td> IVB </Td> <Td> IVA </Td> <Td> carbon family </Td> <Td> tetrels </Td> <Td> tetrels from Greek tetra (four, IV) </Td> </Tr> <Tr> <Td> Group 15 </Td> <Td> VB </Td> <Td> VA </Td> <Td> nitrogen family </Td> <Td> pentels, pnictogens * </Td> <Td> pentels from Greek penta (five, V) </Td> </Tr> <Tr> <Td> Group 16 </Td> <Td> VIB </Td> <Td> VIA </Td> <Td> oxygen family </Td> <Td> chalcogens * </Td> <Td> </Td> </Tr>

Group a and group b in the periodic table