<Tr> <Td_colspan="2"> <Table> <Tr> <Th> IUPAC group number </Th> <Th> 18 </Th> </Tr> <Tr> <Td> Name by element </Td> <Td> helium group or neon group </Td> </Tr> <Tr> <Td> Trivial name </Td> <Td> Noble gases, aerogens </Td> </Tr> <Tr> <Td> CAS group number (US, pattern A-B-A) </Td> <Td> VIIIA </Td> </Tr> <Tr> <Td> old IUPAC number (Europe, pattern A-B) </Td> <Td> 0 </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Th> IUPAC group number </Th> <Th> 18 </Th> </Tr> <Tr> <Td> Name by element </Td> <Td> helium group or neon group </Td> </Tr> <Tr> <Td> Trivial name </Td> <Td> Noble gases, aerogens </Td> </Tr> <Tr> <Td> CAS group number (US, pattern A-B-A) </Td> <Td> VIIIA </Td> </Tr> <Tr> <Td> old IUPAC number (Europe, pattern A-B) </Td> <Td> 0 </Td> </Tr> </Table> <Tr> <Th> IUPAC group number </Th> <Th> 18 </Th> </Tr> <Tr> <Td> Name by element </Td> <Td> helium group or neon group </Td> </Tr>

Existence of which noble gas was first observed in solar eclipse