V periodnem sistemu je transaktinoidni element v d-bloku. Je član 7. periode in je uvrščen med elemente 11. skupine, čeprav niso bili izvedeni nobeni kemični poskusi, ki bi potrdili, da se obnaša kot težji homolog zlata v 11. skupini ter kot deveti član 6d serije prehodnih kovin. Izračunano je, da ima rentgenij podobne lastnosti kot njegovi lažji homologi, baker, srebro in zlato, čeprav lahko kaže nekaj razlik.
↑ 2,02,12,22,3Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). »Transactinides and the future elements«. V Morss; Edelstein, Norman M.; Fuger, Jean (ur.). The Chemistry of the Actinide and Transactinide Elements (3rd izd.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN978-1-4020-3555-5.
↑Gyanchandani, Jyoti; Sikka, S. K. (10. maj 2011). »Physical properties of the 6 d -series elements from density functional theory: Close similarity to lighter transition metals«. Physical Review B. 83 (17): 172101. doi:10.1103/PhysRevB.83.172101. {{navedi časopis}}: |access-date= potrebuje |url= (pomoč)
↑Kratz; Lieser (2013). Nuclear and Radiochemistry: Fundamentals and Applications (3rd izd.). str. 631.
↑Conradie, Jeanet; Ghosh, Abhik (15. junij 2019). »Theoretical Search for the Highest Valence States of the Coinage Metals: Roentgenium Heptafluoride May Exist«. Inorganic Chemistry. 2019 (58): 8735–8738. doi:10.1021/acs.inorgchem.9b01139. PMID31203606.
↑Oganessian, Yuri Ts.; Abdullin, F. Sh.; Alexander, C.; in sod. (30. maj 2013). »Experimental studies of the 249Bk + 48Ca reaction including decay properties and excitation function for isotopes of element 117, and discovery of the new isotope 277Mt«. Physical Review C. American Physical Society. 87 (054621). Bibcode:2013PhRvC..87e4621O. doi:10.1103/PhysRevC.87.054621.
↑Oganessian, Yu. Ts.; in sod. (2013). »Experimental studies of the 249Bk + 48Ca reaction including decay properties and excitation function for isotopes of element 117, and discovery of the new isotope 277Mt«. Physical Review C. 87 (5): 054621. Bibcode:2013PhRvC..87e4621O. doi:10.1103/PhysRevC.87.054621.
↑Hofmann, S.; Heinz, S.; Mann, R.; in sod. (2016). »Remarks on the Fission Barriers of SHN and Search for Element 120«. V Peninozhkevich, Yu. E.; Sobolev, Yu. G. (ur.). Exotic Nuclei: EXON-2016 Proceedings of the International Symposium on Exotic Nuclei. Exotic Nuclei. str. 155–164. doi:10.1142/9789813226548_0024. ISBN9789813226555.