<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> <Tr> <Th_colspan="2"> ↓ Period </Th> </Tr>

Which of the following properties are characteristic of all naturally occurring noble gases