Isotopes of roentgenium
List of isotopes
Abbreviations: SF: Spontaneous fission Not directly synthesized, occurs as a decay product of ²⁷⁸Nh Not directly synthesized, occurs as a decay product of ²⁸²Nh Not directly synthesized, occurs in decay chain of ²⁸⁷Mc Not directly synthesized, occurs in decay chain of ²⁸⁸Mc Not directly synthesized, occurs in decay chain of ²⁹³Ts Not directly synthesized, occurs in decay chain of ²⁹⁴Ts Not directly synthesized, occurs in decay chain of ²⁸⁷Fl and possibly ²⁹⁹Ubn; unconfirmed Not directly synthesised, occurs in decay chain of ²⁹⁰Fl and ²⁹⁴Lv; unconfirmed

Isotopes of roentgenium

Section Title: List of isotopes
Table Section Text: Abbreviations: SF: Spontaneous fission Not directly synthesized, occurs as a decay product of ²⁷⁸Nh Not directly synthesized, occurs as a decay product of ²⁸²Nh Not directly synthesized, occurs in decay chain of ²⁸⁷Mc Not directly synthesized, occurs in decay chain of ²⁸⁸Mc Not directly synthesized, occurs in decay chain of ²⁹³Ts Not directly synthesized, occurs in decay chain of ²⁹⁴Ts Not directly synthesized, occurs in decay chain of ²⁸⁷Fl and possibly ²⁹⁹Ubn; unconfirmed Not directly synthesised, occurs in decay chain of ²⁹⁰Fl and ²⁹⁴Lv; unconfirmed

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity

272Rg	111	161	272.15327(25)#	2.0(8) ms [3.8(+14−8) ms]	α	268Mt	5+#,6+#

274Rg	111	163	274.15525(19)#	6.4(+307−29) ms	α	270Mt

278Rg	111	167	278.16149(38)#	4.2(+75−17) ms	α	274Mt

279Rg	111	168	279.16272(51)#	0.17(+81−8) s	α	275Mt

280Rg	111	169	280.16514(61)#	3.6(+43−13) s	α (87%)	276Mt

EC (13%)	280Ds

281Rg	111	170	281.16636(89)#	17 (+6−3) s	SF (90%)	(various)

α (10%)	277Mt

282Rg	111	171	282.16912(72)#	2.1 (+1.4-0.6) min	α	278Mt

283Rg	111	172	283.17054(79)#	5.1 min?	SF	(various)

286Rg	111	175	10.7 min?	α	282Mt

Sentence(s)

²⁷⁴Rg have been observed in the decay chain of ²⁷⁸Nh.

final_sentence: ²⁷⁴Rg have been observed in the decay chain of ²⁷⁸Nh.