Radioactivity & half-life

Whether an element has stable isotopes, and for the others the longest-lived known isotope with its half-life and decay mode. Half-life always belongs to an isotope, never to an element in general.

Data available 118 of 118 Has stable isotopes 76No stable isotopes 42

Showing 118 of 118 elements

	Symbol	Name
1	H	Hydrogen	Has stable isotopes	—	∞	—
2	He	Helium	Has stable isotopes	—	∞	—
3	Li	Lithium	Has stable isotopes	—	∞	—
4	Be	Beryllium	Has stable isotopes	—	∞	—
5	B	Boron	Has stable isotopes	—	∞	—
6	C	Carbon	Has stable isotopes	—	∞	—
7	N	Nitrogen	Has stable isotopes	—	∞	—
8	O	Oxygen	Has stable isotopes	—	∞	—
9	F	Fluorine	Has stable isotopes	—	∞	—
10	Ne	Neon	Has stable isotopes	—	∞	—
11	Na	Sodium	Has stable isotopes	—	∞	—
12	Mg	Magnesium	Has stable isotopes	—	∞	—
13	Al	Aluminum	Has stable isotopes	—	∞	—
14	Si	Silicon	Has stable isotopes	—	∞	—
15	P	Phosphorus	Has stable isotopes	—	∞	—
16	S	Sulfur	Has stable isotopes	—	∞	—
17	Cl	Chlorine	Has stable isotopes	—	∞	—
18	Ar	Argon	Has stable isotopes	—	∞	—
19	K	Potassium	Has stable isotopes	—	∞	—
20	Ca	Calcium	Has stable isotopes	—	∞	—
21	Sc	Scandium	Has stable isotopes	—	∞	—
22	Ti	Titanium	Has stable isotopes	—	∞	—
23	V	Vanadium	Has stable isotopes	—	∞	—
24	Cr	Chromium	Has stable isotopes	—	∞	—
25	Mn	Manganese	Has stable isotopes	—	∞	—
26	Fe	Iron	Has stable isotopes	—	∞	—
27	Co	Cobalt	Has stable isotopes	—	∞	—
28	Ni	Nickel	Has stable isotopes	—	∞	—
29	Cu	Copper	Has stable isotopes	—	∞	—
30	Zn	Zinc	Has stable isotopes	—	∞	—
31	Ga	Gallium	Has stable isotopes	—	∞	—
32	Ge	Germanium	Has stable isotopes	—	∞	—
33	As	Arsenic	Has stable isotopes	—	∞	—
34	Se	Selenium	Has stable isotopes	—	∞	—
35	Br	Bromine	Has stable isotopes	—	∞	—
36	Kr	Krypton	Has stable isotopes	—	∞	—
37	Rb	Rubidium	Has stable isotopes	—	∞	—
38	Sr	Strontium	Has stable isotopes	—	∞	—
39	Y	Yttrium	Has stable isotopes	—	∞	—
40	Zr	Zirconium	Has stable isotopes	—	∞	—
41	Nb	Niobium	Has stable isotopes	—	∞	—
42	Mo	Molybdenum	Has stable isotopes	—	∞	—
43	Tc	Technetium	No stable isotopes	Tc-98	4.2 My	β-=100%
44	Ru	Ruthenium	Has stable isotopes	—	∞	—
45	Rh	Rhodium	Has stable isotopes	—	∞	—
46	Pd	Palladium	Has stable isotopes	—	∞	—
47	Ag	Silver	Has stable isotopes	—	∞	—
48	Cd	Cadmium	Has stable isotopes	—	∞	—
49	In	Indium	Has stable isotopes	—	∞	—
50	Sn	Tin	Has stable isotopes	—	∞	—
51	Sb	Antimony	Has stable isotopes	—	∞	—
52	Te	Tellurium	Has stable isotopes	—	∞	—
53	I	Iodine	Has stable isotopes	—	∞	—
54	Xe	Xenon	Has stable isotopes	—	∞	—
55	Cs	Cesium	Has stable isotopes	—	∞	—
56	Ba	Barium	Has stable isotopes	—	∞	—
57	La	Lanthanum	Has stable isotopes	—	∞	—
58	Ce	Cerium	Has stable isotopes	—	∞	—
59	Pr	Praseodymium	Has stable isotopes	—	∞	—
60	Nd	Neodymium	Has stable isotopes	—	∞	—
61	Pm	Promethium	No stable isotopes	Pm-145	17.7 y	ε=100%
62	Sm	Samarium	Has stable isotopes	—	∞	—
63	Eu	Europium	No stable isotopes	Eu-151	4.6 Ey	α=100%
64	Gd	Gadolinium	Has stable isotopes	—	∞	—
65	Tb	Terbium	Has stable isotopes	—	∞	—
66	Dy	Dysprosium	Has stable isotopes	—	∞	—
67	Ho	Holmium	Has stable isotopes	—	∞	—
68	Er	Erbium	Has stable isotopes	—	∞	—
69	Tm	Thulium	Has stable isotopes	—	∞	—
70	Yb	Ytterbium	Has stable isotopes	—	∞	—
71	Lu	Lutetium	Has stable isotopes	—	∞	—
72	Hf	Hafnium	Has stable isotopes	—	∞	—
73	Ta	Tantalum	Has stable isotopes	—	∞	—
74	W	Tungsten	No stable isotopes	W-184	8.9 Zy	α ?
75	Re	Rhenium	Has stable isotopes	—	∞	—
76	Os	Osmium	No stable isotopes	Os-192	53 Ey	2β- ?
77	Ir	Iridium	Has stable isotopes	—	∞	—
78	Pt	Platinum	Has stable isotopes	—	∞	—
79	Au	Gold	Has stable isotopes	—	∞	—
80	Hg	Mercury	Has stable isotopes	—	∞	—
81	Tl	Thallium	Has stable isotopes	—	∞	—
82	Pb	Lead	No stable isotopes	Pb-208	2.6 Zy	α ?
83	Bi	Bismuth	No stable isotopes	Bi-209	20.1 Ey	α=100%
84	Po	Polonium	No stable isotopes	Po-209	124 y	α=99.546±0.7%
85	At	Astatine	No stable isotopes	At-210	8.1 h	β+=99.825±2%
86	Rn	Radon	No stable isotopes	Rn-222	3.82 d	α=100%
87	Fr	Francium	No stable isotopes	Fr-223	22 min	β-≈100%
88	Ra	Radium	No stable isotopes	Ra-226	1.6 ky	α=100%
89	Ac	Actinium	No stable isotopes	Ac-227	21.8 y	β-=98.62±3.6%
90	Th	Thorium	No stable isotopes	Th-232	14 Gy	α=100%
91	Pa	Protactinium	No stable isotopes	Pa-231	32.6 ky	α=100%
92	U	Uranium	No stable isotopes	U-238	4.46 Gy	α=100%
93	Np	Neptunium	No stable isotopes	Np-237	2.14 My	α=100%
94	Pu	Plutonium	No stable isotopes	Pu-244	81.3 My	α=99.877±0.6%
95	Am	Americium	No stable isotopes	Am-243	7.35 ky	α=100%
96	Cm	Curium	No stable isotopes	Cm-247	15.6 My	α=100%
97	Bk	Berkelium	No stable isotopes	Bk-247	1.38 ky	α≈100%
98	Cf	Californium	No stable isotopes	Cf-251	898 y	α≈100%
99	Es	Einsteinium	No stable isotopes	Es-252	1.29 y	α=78±0.2%
100	Fm	Fermium	No stable isotopes	Fm-257	101 d	α=99.790±0.4%
101	Md	Mendelevium	No stable isotopes	Md-258	51.6 d	α≈100%
102	No	Nobelium	No stable isotopes	No-261	3 h	α ?
103	Lr	Lawrencium	No stable isotopes	Lr-266	22 h	SF=100%
104	Rf	Rutherfordium	No stable isotopes	Rf-266	4 h	α ?
105	Db	Dubnium	No stable isotopes	Db-268	1.21 d	SF≈100%
106	Sg	Seaborgium	No stable isotopes	Sg-269	5 min	α≈100%
107	Bh	Bohrium	No stable isotopes	Bh-270	3.8 min	α=100%
108	Hs	Hassium	No stable isotopes	Hs-269	15 s	α=100%
109	Mt	Meitnerium	No stable isotopes	Mt-279	20 s	α ?
110	Ds	Darmstadtium	No stable isotopes	Ds-282	4.2 min	α≈100%
111	Rg	Roentgenium	No stable isotopes	Rg-282	2.17 min	α=100%
112	Cn	Copernicium	No stable isotopes	Cn-285	30 s	α=100%
113	Nh	Nihonium	No stable isotopes	Nh-289	30 s	α ?
114	Fl	Flerovium	No stable isotopes	Fl-290	1.33 min	α≈100%
115	Mc	Moscovium	No stable isotopes	Mc-292	5 s	α ?
116	Lv	Livermorium	No stable isotopes	Lv-293	70 ms	α≈100%
117	Ts	Tennessine	No stable isotopes	Ts-294	70 ms	α=100%
118	Og	Oganesson	No stable isotopes	Og-293	1 ms	α ?