Atomic Masses

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Atomic Masses

Atomic Masses
Atomic Number, Z	Name	Atomic Mass Number, A	Symbol	Atomic Mass (u)	Percent Abundance or Decay Mode	Half-life, t_1/2
0	neutron	1	$n$	1.008 665	${\beta }^{-}$	10.37 min
1	Hydrogen	1	${\text{}}^{1}\text{H}$	1.007 825	99.985%
	Deuterium	2	${\text{}}^{2}\text{H or D}$	2.014 102	0.015%
	Tritium	3	${\text{}}^{3}\text{H or T}$	3.016 050	${\beta }^{-}$	12.33 y
2	Helium	3	${\text{}}^{3}\text{He}$	3.016 030	* QuickLaTeX cannot compile formula: 1\text{.}\text{38}×{\text{10}}^{-4}\text{}\text{%} * Error message: File ended while scanning use of \text@. Emergency stop.
		4	${\text{}}^{4}\text{He}$	4.002 603	* QuickLaTeX cannot compile formula: \text{≈100%}\text{} * Error message: File ended while scanning use of \text@. Emergency stop.
3	Lithium	6	${\text{}}^{6}\text{Li}$	6.015 121	7.5%
		7	${\text{}}^{7}\text{Li}$	7.016 003	92.5%
4	Beryllium	7	${\text{}}^{7}\text{Be}$	7.016 928	EC	53.29 d
		9	${\text{}}^{9}\text{Be}$	9.012 182	100%
5	Boron	10	${\text{}}^{10}\text{B}$	10.012 937	19.9%
		11	${\text{}}^{11}\text{B}$	11.009 305	80.1%
6	Carbon	11	${\text{}}^{11}\text{C}$	11.011 432	EC, ${\beta }^{+}$
		12	${\text{}}^{12}\text{C}$	12.000 000	98.90%
		13	${\text{}}^{13}\text{C}$	13.003 355	1.10%
		14	${\text{}}^{14}\text{C}$	14.003 241	${\beta }^{-}$	5730 y
7	Nitrogen	13	${\text{}}^{13}\text{N}$	13.005 738	${\beta }^{+}$	9.96 min
		14	${\text{}}^{14}\text{N}$	14.003 074	99.63%
		15	${\text{}}^{15}\text{N}$	15.000 108	0.37%
8	Oxygen	15	${\text{}}^{15}\text{O}$	15.003 065	EC, ${\beta }^{+}$	122 s
		16	${\text{}}^{16}\text{O}$	15.994 915	99.76%
		18	${\text{}}^{18}\text{O}$	17.999 160	0.200%
9	Fluorine	18	${\text{}}^{18}\text{F}$	18.000 937	EC, ${\beta }^{+}$	1.83 h
		19	${\text{}}^{19}\text{F}$	18.998 403	100%
10	Neon	20	${\text{}}^{20}\text{Ne}$	19.992 435	90.51%
		22	${\text{}}^{22}\text{Ne}$	21.991 383	9.22%
11	Sodium	22	${\text{}}^{22}\text{Na}$	21.994 434	${\beta }^{+}$	2.602 y
		23	${\text{}}^{23}\text{Na}$	22.989 767	100%
		24	${\text{}}^{24}\text{Na}$	23.990 961	${\beta }^{-}$	14.96 h
12	Magnesium	24	${\text{}}^{24}\text{Mg}$	23.985 042	78.99%
13	Aluminum	27	${\text{}}^{27}\text{Al}$	26.981 539	100%
14	Silicon	28	${\text{}}^{28}\text{Si}$	27.976 927	92.23%	2.62h
		31	${\text{}}^{31}\text{Si}$	30.975 362	${\beta }^{-}$
15	Phosphorus	31	${\text{}}^{31}\text{P}$	30.973 762	100%
		32	${\text{}}^{32}\text{P}$	31.973 907	${\beta }^{-}$	14.28 d
16	Sulfur	32	${\text{}}^{32}\text{S}$	31.972 070	95.02%
		35	${\text{}}^{35}\text{S}$	34.969 031	${\beta }^{-}$	87.4 d
17	Chlorine	35	${\text{}}^{35}\text{Cl}$	34.968 852	75.77%
		37	${\text{}}^{37}\text{Cl}$	36.965 903	24.23%
18	Argon	40	${\text{}}^{40}\text{Ar}$	39.962 384	99.60%
19	Potassium	39	${\text{}}^{39}\text{K}$	38.963 707	93.26%
		40	${\text{}}^{40}\text{K}$	39.963 999	0.0117%, EC, ${\beta }^{-}$	$1\text{.}\text{28}×{\text{10}}^{9}\text{y}$
20	Calcium	40	${\text{}}^{40}\text{Ca}$	39.962 591	96.94%
21	Scandium	45	${\text{}}^{45}\text{Sc}$	44.955 910	100%
22	Titanium	48	${\text{}}^{48}\text{Ti}$	47.947 947	73.8%
23	Vanadium	51	${\text{}}^{51}\text{V}$	50.943 962	99.75%
24	Chromium	52	${\text{}}^{52}\text{Cr}$	51.940 509	83.79%
25	Manganese	55	${\text{}}^{55}\text{Mn}$	54.938 047	100%
26	Iron	56	${\text{}}^{56}\text{Fe}$	55.934 939	91.72%
27	Cobalt	59	${\text{}}^{59}\text{Co}$	58.933 198	100%
		60	${\text{}}^{60}\text{Co}$	59.933 819	${\beta }^{-}$	5.271 y
28	Nickel	58	${\text{}}^{58}\text{Ni}$	57.935 346	68.27%
		60	${\text{}}^{60}\text{Ni}$	59.930 788	26.10%
29	Copper	63	${\text{}}^{63}\text{Cu}$	62.939 598	69.17%
		65	${\text{}}^{65}\text{Cu}$	64.927 793	30.83%
30	Zinc	64	${\text{}}^{64}\text{Zn}$	63.929 145	48.6%
		66	${\text{}}^{66}\text{Zn}$	65.926 034	27.9%
31	Gallium	69	${\text{}}^{69}\text{Ga}$	68.925 580	60.1%
32	Germanium	72	${\text{}}^{72}\text{Ge}$	71.922 079	27.4%
		74	${\text{}}^{74}\text{Ge}$	73.921 177	36.5%
33	Arsenic	75	${\text{}}^{75}\text{As}$	74.921 594	100%
34	Selenium	80	${\text{}}^{80}\text{Se}$	79.916 520	49.7%
35	Bromine	79	${\text{}}^{79}\text{Br}$	78.918 336	50.69%
36	Krypton	84	${\text{}}^{84}\text{Kr}$	83.911 507	57.0%
37	Rubidium	85	${\text{}}^{85}\text{Rb}$	84.911 794	72.17%
38	Strontium	86	${\text{}}^{86}\text{Sr}$	85.909 267	9.86%
		88	${\text{}}^{88}\text{Sr}$	87.905 619	82.58%
		90	${\text{}}^{90}\text{Sr}$	89.907 738	${\beta }^{-}$	28.8 y
39	Yttrium	89	${\text{}}^{89}\text{Y}$	88.905 849	100%
		90	${\text{}}^{90}\text{Y}$	89.907 152	${\beta }^{-}$	64.1 h
40	Zirconium	90	${\text{}}^{90}\text{Zr}$	89.904 703	51.45%
41	Niobium	93	${\text{}}^{93}\text{Nb}$	92.906 377	100%
42	Molybdenum	98	${\text{}}^{98}\text{Mo}$	97.905 406	24.13%
43	Technetium	98	${\text{}}^{98}\text{Tc}$	97.907 215	${\beta }^{-}$	$4\text{.}2×{\text{10}}^{6}\text{y}$
44	Ruthenium	102	${\text{}}^{102}\text{Ru}$	101.904 348	31.6%
45	Rhodium	103	${\text{}}^{103}\text{Rh}$	102.905 500	100%
46	Palladium	106	${\text{}}^{106}\text{Pd}$	105.903 478	27.33%
47	Silver	107	${\text{}}^{107}\text{Ag}$	106.905 092	51.84%
		109	${\text{}}^{109}\text{Ag}$	108.904 757	48.16%
48	Cadmium	114	${\text{}}^{114}\text{Cd}$	113.903 357	28.73%
49	Indium	115	${\text{}}^{115}\text{In}$	114.903 880	95.7%, ${\beta }^{-}$	$4\text{.}4×{\text{10}}^{\text{14}}\text{y}$
50	Tin	120	${\text{}}^{120}\text{Sn}$	119.902 200	32.59%
51	Antimony	121	${\text{}}^{121}\text{Sb}$	120.903 821	57.3%
52	Tellurium	130	${\text{}}^{130}\text{Te}$	129.906 229	33.8%, ${\beta }^{-}$	$2\text{.}5×{\text{10}}^{\text{21}}\text{y}$
53	Iodine	127	${\text{}}^{127}\text{I}$	126.904 473	100%
		131	${\text{}}^{131}\text{I}$	130.906 114	${\beta }^{-}$	8.040 d
54	Xenon	132	${\text{}}^{132}\text{Xe}$	131.904 144	26.9%
		136	${\text{}}^{136}\text{Xe}$	135.907 214	8.9%
55	Cesium	133	${\text{}}^{133}\text{Cs}$	132.905 429	100%
		134	${\text{}}^{134}\text{Cs}$	133.906 696	EC, ${\beta }^{-}$	2.06 y
56	Barium	137	${\text{}}^{137}\text{Ba}$	136.905 812	11.23%
		138	${\text{}}^{138}\text{Ba}$	137.905 232	71.70%
57	Lanthanum	139	${\text{}}^{139}\text{La}$	138.906 346	99.91%
58	Cerium	140	${\text{}}^{140}\text{Ce}$	139.905 433	88.48%
59	Praseodymium	141	${\text{}}^{141}\text{Pr}$	140.907 647	100%
60	Neodymium	142	${\text{}}^{142}\text{Nd}$	141.907 719	27.13%
61	Promethium	145	${\text{}}^{145}\text{Pm}$	144.912 743	EC, $\alpha$	17.7 y
62	Samarium	152	${\text{}}^{152}\text{Sm}$	151.919 729	26.7%
63	Europium	153	${\text{}}^{153}\text{Eu}$	152.921 225	52.2%
64	Gadolinium	158	${\text{}}^{158}\text{Gd}$	157.924 099	24.84%
65	Terbium	159	${\text{}}^{159}\text{Tb}$	158.925 342	100%
66	Dysprosium	164	${\text{}}^{164}\text{Dy}$	163.929 171	28.2%
67	Holmium	165	${\text{}}^{165}\text{Ho}$	164.930 319	100%
68	Erbium	166	${\text{}}^{166}\text{Er}$	165.930 290	33.6%
69	Thulium	169	${\text{}}^{169}\text{Tm}$	168.934 212	100%
70	Ytterbium	174	${\text{}}^{174}\text{Yb}$	173.938 859	31.8%
71	Lutecium	175	${\text{}}^{175}\text{Lu}$	174.940 770	97.41%
72	Hafnium	180	${\text{}}^{180}\text{Hf}$	179.946 545	35.10%
73	Tantalum	181	${\text{}}^{181}\text{Ta}$	180.947 992	99.98%
74	Tungsten	184	${\text{}}^{184}\text{W}$	183.950 928	30.67%
75	Rhenium	187	${\text{}}^{187}\text{Re}$	186.955 744	62.6%, ${\beta }^{-}$	$4\text{.}6×{\text{10}}^{\text{10}}\text{y}$
76	Osmium	191	${\text{}}^{191}\text{Os}$	190.960 920	${\beta }^{-}$	15.4 d
		192	${\text{}}^{192}\text{Os}$	191.961 467	41.0%
77	Iridium	191	${\text{}}^{191}\text{Ir}$	190.960 584	37.3%
		193	${\text{}}^{193}\text{Ir}$	192.962 917	62.7%
78	Platinum	195	${\text{}}^{195}\text{Pt}$	194.964 766	33.8%
79	Gold	197	${\text{}}^{197}\text{Au}$	196.966 543	100%
		198	${\text{}}^{198}\text{Au}$	197.968 217	${\beta }^{-}$	2.696 d
80	Mercury	199	${\text{}}^{199}\text{Hg}$	198.968 253	16.87%
		202	${\text{}}^{202}\text{Hg}$	201.970 617	29.86%
81	Thallium	205	${\text{}}^{205}\text{Tl}$	204.974 401	70.48%
82	Lead	206	${\text{}}^{206}\text{Pb}$	205.974 440	24.1%
		207	${\text{}}^{207}\text{Pb}$	206.975 872	22.1%
		208	${\text{}}^{208}\text{Pb}$	207.976 627	52.4%
		210	${\text{}}^{210}\text{Pb}$	209.984 163	$\alpha ,\phantom{\rule{0.20em}{0ex}}{\beta }^{-}$	22.3 y
		211	${\text{}}^{211}\text{Pb}$	210.988 735	${\beta }^{-}$	36.1 min
		212	${\text{}}^{212}\text{Pb}$	211.991 871	${\beta }^{-}$	10.64 h
83	Bismuth	209	${\text{}}^{209}\text{Bi}$	208.980 374	100%
		211	${\text{}}^{211}\text{Bi}$	210.987 255	$\alpha ,\phantom{\rule{0.20em}{0ex}}{\beta }^{-}$	2.14 min
84	Polonium	210	${\text{}}^{210}\text{Po}$	209.982 848	$\alpha$	138.38 d
85	Astatine	218	${\text{}}^{218}\text{At}$	218.008 684	$\alpha ,\phantom{\rule{0.20em}{0ex}}{\beta }^{-}$	1.6 s
86	Radon	222	${\text{}}^{222}\text{Rn}$	222.017 570	$\alpha$	3.82 d
87	Francium	223	${\text{}}^{223}\text{Fr}$	223.019 733	$\alpha ,\phantom{\rule{0.20em}{0ex}}{\beta }^{-}$	21.8 min
88	Radium	226	${\text{}}^{226}\text{Ra}$	226.025 402	$\alpha$	$1\text{.}\text{60}×{\text{10}}^{3}\text{y}$
89	Actinium	227	${\text{}}^{227}\text{Ac}$	227.027 750	$\alpha ,\phantom{\rule{0.20em}{0ex}}{\beta }^{-}$	21.8 y
90	Thorium	228	${\text{}}^{228}\text{Th}$	228.028 715	$\alpha$	1.91 y
		232	${\text{}}^{232}\text{Th}$	232.038 054	100%, $\alpha$	$1\text{.}\text{41}×{\text{10}}^{\text{10}}\text{y}$
91	Protactinium	231	${\text{}}^{231}\text{Pa}$	231.035 880	$\alpha$	$3\text{.}\text{28}×{\text{10}}^{4}\text{y}$
92	Uranium	233	${\text{}}^{233}\text{U}$	233.039 628	$\alpha$	$1\text{.}\text{59}×{\text{10}}^{3}\text{y}$
		235	${\text{}}^{235}\text{U}$	235.043 924	0.720%, $\alpha$	$7\text{.}\text{04}×{\text{10}}^{8}\text{y}$
		236	${\text{}}^{236}\text{U}$	236.045 562	$\alpha$	$2\text{.}\text{34}×{\text{10}}^{7}\text{y}$
		238	${\text{}}^{238}\text{U}$	238.050 784	99.2745%, $\alpha$	$4\text{.}\text{47}×{\text{10}}^{9}\text{y}$
		239	${\text{}}^{239}\text{U}$	239.054 289	${\beta }^{-}$	23.5 min
93	Neptunium	239	${\text{}}^{239}\text{Np}$	239.052 933	${\beta }^{-}$	2.355 d
94	Plutonium	239	${\text{}}^{239}\text{Pu}$	239.052 157	$\alpha$	$2\text{.}\text{41}×{\text{10}}^{4}\text{y}$
95	Americium	243	${\text{}}^{243}\text{Am}$	243.061 375	$\alpha ,$ fission	$7\text{.}\text{37}×{\text{10}}^{3}\text{y}$
96	Curium	245	${\text{}}^{245}\text{Cm}$	245.065 483	$\alpha$	$8\text{.}\text{50}×{\text{10}}^{3}\text{y}$
97	Berkelium	247	${\text{}}^{247}\text{Bk}$	247.070 300	$\alpha$	$1\text{.}\text{38}×{\text{10}}^{3}\text{y}$
98	Californium	249	${\text{}}^{249}\text{Cf}$	249.074 844	$\alpha$	351 y
99	Einsteinium	254	${\text{}}^{254}\text{Es}$	254.088 019	$\alpha ,\phantom{\rule{0.20em}{0ex}}{\beta }^{-}$	276 d
100	Fermium	253	${\text{}}^{253}\text{Fm}$	253.085 173	EC, $\alpha$	3.00 d
101	Mendelevium	255	${\text{}}^{255}\text{Md}$	255.091 081	EC, $\alpha$	27 min
102	Nobelium	255	${\text{}}^{255}\text{No}$	255.093 260	EC, $\alpha$	3.1 min
103	Lawrencium	257	${\text{}}^{257}\text{Lr}$	257.099 480	EC, $\alpha$	0.646 s
104	Rutherfordium	261	${\text{}}^{261}\text{Rf}$	261.108 690	$\alpha$	1.08 min
105	Dubnium	262	${\text{}}^{262}\text{Db}$	262.113 760	$\alpha ,$ fission	34 s
106	Seaborgium	263	${\text{}}^{263}\text{Sg}$	263.11 86	$\alpha ,$ fission	0.8 s
107	Bohrium	262	${\text{}}^{262}\text{Bh}$	262.123 1	$\alpha$	0.102 s
108	Hassium	264	${\text{}}^{264}\text{Hs}$	264.128 5	$\alpha$	0.08 ms
109	Meitnerium	266	${\text{}}^{266}\text{Mt}$	266.137 8	$\alpha$	3.4 ms

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