↑Шуэнь-Чэнь Хуан, Роберт Д. Лэйн, Даниел А. Морган (2005). "Инерт хий". Кирк Отмерын химийн технологийн нэвтэрхий толь бичиг, 343–383 хуудас. Wiley. doi:10.1002/0471238961.0701190508230114.a01.pub2
↑Ne(0) has been observed in Cr(CO)5Ne; see Perutz, Robin N.; Turner, James J. (August 1975). "Photochemistry of the Group 6 hexacarbonyls in low-temperature matrices. III. Interaction of the pentacarbonyls with noble gases and other matrices". Journal of the American Chemical Society. 97 (17): 4791–4800. Bibcode:1975JAChS..97.4791P. doi:10.1021/ja00850a001.
↑Group 18 refers to the modern numbering of the periodic table. Older numberings described the rare gases as Group 0 or Group VIIIA (sometimes shortened to 8).