<Tr> <Td> 64 </Td> <Td> gadolinium </Td> <Td> 6 </Td> <Td> </Td> <Td> 158 Gd </Td> <Td> 160 Gd </Td> <Td> 156 Gd </Td> <Td> 157 Gd </Td> <Td> 155 Gd </Td> <Td> 154 Gd </Td> <Td> 152 Gd </Td> </Tr> <Tr> <Td> 76 </Td> <Td> osmium </Td> <Td> 6 </Td> <Td> </Td> <Td> 192 Os </Td> <Td> 190 Os </Td> <Td> 189 Os </Td> <Td> 188 Os </Td> <Td> 187 Os </Td> <Td> 186 Os </Td> <Td> 184 Os </Td> </Tr> <Tr> <Td> 60 </Td> <Td> neodymium </Td> <Td> 5 </Td> <Td> </Td> <Td> 142 Nd </Td> <Td> 144 Nd </Td> <Td> 146 Nd </Td> <Td> 143 Nd </Td> <Td> 145 Nd </Td> <Td> 148 Nd </Td> <Td> 150 Nd </Td> </Tr> <Tr> <Td> 62 </Td> <Td> samarium </Td> <Td> 5 </Td> <Td> </Td> <Td> 152 Sm </Td> <Td> 154 Sm </Td> <Td> 147 Sm </Td> <Td> 149 Sm </Td> <Td> 148 Sm </Td> <Td> 150 Sm </Td> <Td> 144 Sm </Td> </Tr>

Where are most unstable nuclei found in the periodic table