<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> 5 </Th> <Th> 6 </Th> <Th> 7 </Th> <Th> 8 </Th> <Th> 9 </Th> <Th> 10 </Th> <Th> 11 </Th> <Th> 12 </Th> <Th> 13 </Th> <Th> 14 </Th> <Th> 15 </Th> <Th> 16 </Th> <Th> 17 </Th> <Th> 18 </Th> </Tr> <Tr> <Th_colspan="3"> Group → </Th> </Tr> <Tr> <Th_colspan="3"> ↓ Period </Th> </Tr>

Geochemical classification and distribution of elements in the earth