<Tr> <Td> 69 </Td> <Td> Tm </Td> <Td> Thulium </Td> <Td> Thule, the ancient name for Scandinavia </Td> <Td> </Td> <Td> 6 </Td> <Td> 168.93422 (2) </Td> <Td> 9.321 </Td> <Td> 1818 </Td> <Td> 2223 </Td> <Td> 0.16 </Td> <Td> 1.25 </Td> <Td> 0.52 </Td> </Tr> <Tr> <Td> 70 </Td> <Td> Yb </Td> <Td> Ytterbium </Td> <Td> Ytterby, Sweden </Td> <Td> </Td> <Td> 6 </Td> <Td> 173.045 (10) </Td> <Td> 6.965 </Td> <Td> 1097 </Td> <Td> 1469 </Td> <Td> 0.155 </Td> <Td> 1.1 </Td> <Td> 3.2 </Td> </Tr> <Tr> <Td> 71 </Td> <Td> Lu </Td> <Td> Lutetium </Td> <Td> Lutetia, the Latin name for Paris </Td> <Td> </Td> <Td> 6 </Td> <Td> 174.9668 (1) </Td> <Td> 9.84 </Td> <Td> 1925 </Td> <Td> 3675 </Td> <Td> 0.154 </Td> <Td> 1.27 </Td> <Td> 0.8 </Td> </Tr> <Tr> <Td> 72 </Td> <Td> Hf </Td> <Td> Hafnium </Td> <Td> Hafnia, the New Latin name for Copenhagen </Td> <Td> </Td> <Td> 6 </Td> <Td> 178.49 (2) </Td> <Td> 13.31 </Td> <Td> 2506 </Td> <Td> 4876 </Td> <Td> 0.144 </Td> <Td> 1.3 </Td> <Td> </Td> </Tr>

What are the types of elements in chemistry