List of elements by half-life

This is a list of chemical elements sorted by element half-life of the most long-lived isotope for that element. The elements shown in the list are colour coded according to chemical series. Numbers in parentheses give the uncertainty in the "concise notation" defined in the IUPAC reference "whereby standard uncertainty is given in parenthesis next to the least significant digits to which it applies", e.g., 1.00794(7) stands for 1.00794 ± 0.00007. Template:Element color legend

Atomic No.	Name	Half-life	most long-lived isotope
1	hydrogen	stable	hydrogen-1
2	helium	stable	helium-4
3	lithium	stable	lithium-7
4	beryllium	stable	beryllium-9
5	boron	stable	beryllium-11
6	carbon	stable	carbon-12
7	nitrogen	stable	nitrogen-14
8	oxygen	stable	oxygen-16
9	fluorine	stable	fluorine-19
10	neon	stable	neon-20
11	sodium	stable
12	magnesium	stable
13	aluminium	stable
14	silicon	stable
15	phosphorus	stable
16	sulfur	stable
17	chlorine	stable
18	argon	stable
19	potassium	stable
20	calcium	stable
21	scandium	stable
22	titanium	stable
23	vanadium	stable
24	chromium	stable
25	manganese	stable
26	iron	stable
27	cobalt	stable
28	nickel	stable
29	copper	stable
30	zinc	stable
31	gallium	stable
32	germanium	stable
33	arsenic	stable
34	selenium	stable
35	bromine	stable
36	krypton	stable
37	rubidium	stable
38	strontium	stable
39	yttrium	stable
40	zirconium	stable
41	niobium	stable
42	molybdenum	stable
44	ruthenium	stable
45	rhodium	stable
46	palladium	stable
47	silver	stable
48	cadmium	stable
49	indium	stable
50	tin	stable
51	antimony	stable
52	tellurium	stable
53	iodine	stable
54	xenon	stable
55	caesium	stable
56	barium	stable
57	lanthanum	stable
58	cerium	stable
59	praseodymium	stable
60	neodymium	stable
62	samarium	stable
63	europium	stable
64	gadolinium	stable
65	terbium	stable
66	dysprosium	stable
67	holmium	stable
68	erbium	stable
69	thulium	stable
70	ytterbium	stable
71	lutetium	stable
72	hafnium	stable
73	tantalum	stable
74	tungsten	stable
75	rhenium	stable
76	osmium	stable
77	iridium	stable
78	platinum	stable
79	gold	stable
80	mercury	stable
81	thallium	stable
82	lead	stable
83	bismuth	stable
90	thorium	<math>1.405x10^{10}</math> years (y)
92	uranium	<math>4.468x10^9</math> y
94	plutonium	<math>8.08x10^7</math> y
96	curium	<math>1.56x10^7</math> y
93	neptunium	<math>2.144x10^6</math> y
43	technetium	211,100 y
91	protactinium	32,760 y
95	americium	7370 y
88	radium	1602 y
97	berkelium	1380 y
98	californium	898 y
84	polonium	103 y
89	actinium	21.77 y
61	promethium	17.7 y
99	einsteinium	471.7 days (d)
100	fermium	100.5 d
101	mendelevium	51.5 d
86	radon	3.82 d
105	dubnium	32 hours (h)
104	rutherfordium	13 h
103	lawrencium	10 h
85	astatine	8.1 h
107	bohrium	1.5 h
106	seaborgium	1 h
108	hassium	1 h
102	nobelium	58 minutes (m)
109	meitnerium	30 m
87	francium	22.0 m
113	ununtrium	20 m
111	roentgenium	10 m
115	ununpentium	1 m
110	darmstadtium	11 seconds (s)
112	ununbium	10 s
114	ununquadium	5 s
116	ununhexium	0.018 s