<Tr> <Td> 49 </Td> <Td> 50 </Td> <Td> tin </Td> <Td> Sn </Td> <Td> 0 </Td> <Td> 2.2 </Td> <Td> 2.2 </Td> <Td> </Td> <Td> 2.3 </Td> <Td> 280,000 </Td> </Tr> <Tr> <Td> 50 </Td> <Td> 63 </Td> <Td> europium </Td> <Td> Eu </Td> <Td> </Td> <Td> 2.1 </Td> <Td> 1.8 </Td> <Td> </Td> <Td> 2.0 </Td> <Td> </Td> </Tr> <Tr> <Td> 51 </Td> <Td> 92 </Td> <Td> uranium </Td> <Td> U </Td> <Td> </Td> <Td> 0 </Td> <Td> 1.8 </Td> <Td> </Td> <Td> 2.7 </Td> <Td> 74,119 </Td> </Tr> <Tr> <Td> 52 </Td> <Td> 73 </Td> <Td> tantalum </Td> <Td> Ta </Td> <Td> </Td> <Td> </Td> <Td> 1.7 </Td> <Td> </Td> <Td> 2.0 </Td> <Td> 1,100 </Td> </Tr>

How abundant is uranium in the earth crust
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