Name	Z	Symbol	Mass	Abund.	Symbol	Mass	Abund.	Symbol	Mass	Abund.	Symbol	Mass	Abund.	Symbol	Mass	Abund.	Symbol	Mass	Abund.	Symbol	Mass	Abund.
Hydrogen	1	1H	1.007825	99.99	2H	2.014102	0.015
Helium	2	3He	3.016029	0.0001	4He	4.002603	100
Lithium	3	6Li	6.015123	7.42	7Li	7.016005	92.58
Beryllium	4	9Be	9.012183	100
Boron	5	10B	10.012938	19.8	11B	11.009305	80.2
Carbon	6	12C	12	98.9	13C	13.003355	1.1
Nitrogen	7	14N	14.003074	99.63	15N	15.000109	0.37
Oxygen	8	16O	15.994915	99.76	17O	16.999131	0.038	18O	17.999159	0.2
Fluorine	9	19F	18.998403	100
Neon	10	20Ne	19.992439	90.6	21Ne	20.993845	0.26	22Ne	21.991384	9.2
Sodium	11	23Na	22.98977	100
Magnesium	12	24Mg	23.985045	78.9	25Mg	24.985839	10	26Mg	25.982595	11.1
Aluminum	13	27Al	26.981541	100
Silicon	14	28Si	27.976928	92.23	29Si	28.976496	4.67	30Si	29.973772	3.1
Phosphorus	15	31P	30.973763	100
Sulpher	16	32S	31.972072	95.02	33S	32.971459	0.75	34S	33.967868	4.21	36S	35.967079	0.02
Chlorine	17	35Cl	34.968853	75.77	37Cl	36.965903	24.23
Argon	18	36Ar	35.967546	0.34	38Ar	37.962732	0.063	40Ar	39.962383	99.6
Potassium	19	39K	38.963708	93.2	40K	39.963999	0.012	41K	40.961825	6.73
Calcium	20	40Ca	39.962591	96.95	42Ca	41.958622	0.65	43Ca	42.95877	0.14	44Ca	43.955485	20.86	46Ca	45.953689	0.004	48Ca	47.952532	0.19
Scandium	21	45Sc	44.955914	100
Titanium	22	46Ti	45.952633	8	47Ti	46.951765	7.3	48Ti	47.947947	73.8	49Ti	48.947871	5.5	50Ti	49.944786	5.4
Vanadium	23	50V	49.947161	0.25	51V	50.943963	99.75
Chromium	24	50Cr	49.946046	4.35	52Cr	51.94051	83.79	53Cr	52.940651	9.5	54Cr	53.938882	2.36
Manganese	25	55Mn	54.938046	100
Iron	26	54Fe	53.939612	5.8	56Fe	55.934939	91.72	57Fe	56.935396	2.2	58Fe	57.933278	0.28
Cobalt	27	59Co	58.933198	100
Nickel	28	58Ni	57.935347	68.27	60Ni	59.930789	26.1	61Ni	60.931059	1.13	62Ni	61.928346	3.59	64Ni	63.927968	0.91
Copper	29	63Cu	62.929599	69.17	65Cu	64.927792	30.83
Zinc	30	64Zn	63.929145	48.6	66Zn	65.926035	27.9	67Zn	66.927129	4.1	68Zn	67.924846	18.8	70Zn	69.925325	0.6
Galium	31	69Ga	68.925581	60.1	71Ga	70.924701	39.9
Germanium	32	70Ge	69.92425	20.5	72Ge	71.92208	27.4	73Ge	72.923464	7.8	74Ge	73.921179	36.5	75Ge	75.921403	7.8
Arsenic	33	75As	74.921596	100
Selenium	34	74Se	73.922477	0.9	76Se	75.919207	9	77Se	76.919908	7.6	78Se	77.917304	23.5	80Se	79.916521	49.6	82Se	81.916709	9.4
Bromine	35	81Br	78.918336	50.69	81Br	80.91629	49.31
Krypton	36	78Kr	77.920397	0.35	80Kr	79.916375	2.25	82Kr	81.913483	11.6	83Kr	82.914134	11.5	84Kr	83.911506	57	86Kr	85.910614	17.3
Rubidium	37	85Rb	84.9118	72.17	87Rb	86.909184	27.84
Strontium	38	84Sr	83.913428	0.56	86Sr	85.909273	9.86	87Sr	86.908902	7	88Sr	87.905625	82.58
Yitrium	39	89Y	88.905856	100
Zirconium	40	90Zr	89.904708	51.45	91Zr	90.905644	11.27	92Zr	91.905039	17.17	94Zr	93.906319	17.33	96Zr	95.908272	2.78
Niobium	41	93Nb	92.906378	100
Molybdenum	42	92Mo	91.906809	14.84	94Mo	93.905086	9.25	95Mo	94.905838	15.92	96Mo	95.904676	16.68	97Mo	96.906018	9.55	98Mo	97.905405	24.13	100Mo	99.907473	9.63
Technetium	43	99Tc	98.91	100
Ruthenium	44	96Ru	95.907596	5.52	98Ru	97.905287	1.88	99Ru	98.905937	12.7	100Ru	99.904218	12.6	101Ru	100.905581	17	102Ru	101.904348	31.6	104Ru	103.905422	18.7
Rhodium	45	103Rh	102.905503	100
Palladium	46	102Pd	101.905609	1.02	104Pd	103.904026	11.14	105Pd	104.905075	22.33	106Pd	105.903475	27.33	108Pd	107.903894	26.46	110Pd	109.905169	11.72
Silver	47	107Ag	106.905095	51.84	109Ag	108.904754	48.16
Cadmium	48	106Cd	105.906461	1.25	110Cd	109.903007	12.49	111Cd	110.904182	12.8	112Cd	111.902761	24.13	113Cd	112.904401	12.22	114Cd	113.903361	28.73	116Cd	115.904758	7.49
Indium	49	113In	112.904056	4.3	115In	114.903875	95.7
Tin	50	116Sn	115.901744	14.7	117Sb	116.902954	7.7	118Sn	117.901607	24.3	119Sn	118.90331	8.6	120Sn	119.902199	32.4	122Sn	121.90344	4.6	124Sn	123.905271	5.6
Antimony	51	121Sb	120.903824	57.3	123Sb	122.904222	42.7
Tellurium	52	122Te	121.903055	2.6	123Te	122.904278	0.91	124Te	123.902825	4.82	125Te	124.904435	7.14	126Te	125.90331	18.95	128Te	127.904464	31.69	130Te	129.906229	33.8
Iodine	53	127I	126.904477	100
Xenon	54	128Xe	127.903531	1.91	129Xe	128.90478	26.4	130Xe	129.90351	4.1	131Xe	130.905076	21.2	132Xe	131.904148	26.9	134Xe	133.905395	10.4	136Xe	135.907219	8.9
Cesium	55	133Cs	132.905433	100
Barium	56	130Ba	129.906277	0.11	132Ba	131.905042	0.1	134Ba	133.90449	2.42	135Ba	134.905668	6.59	136Ba	135.904556	7.85	137Ba	136.905816	11.23	138Ba	137.905236	71.7
Lanthanum	57	138La	137.907114	0.09	139La	138.906355	99.91
Cerium	58	136Ce	135.90714	0.19	138Ce	137.905996	0.25	140Ce	139.905442	88.48	142Ce	141.909249	11.08
Praseodyium	59	141Pr	140.907657	100
Neodymium	60	142Nd	141.907731	27.13	143Nd	142.909823	12.18	144Nd	143.910096	23.8	145Nd	144.912582	8.3	146Nd	145.913126	17.19	148Nd	147.916901	5.76	150Nd	149.9209	5.64
Promethium	61	145Pm	145	100
Samarium	62	144Sm	143.912009	3.1	147Sm	146.914907	15	148Sm	147.914832	11.3	149Sm	148.917193	13.8	150Sm	149.917285	7.4	152Sm	151.919741	25.7	154Sm	153.922218	22.7
Europium	63	151Eu	150.91986	47.8	153Eu	152.921243	52.2
Gadolinium	64	152Gd	151.919803	0.2	154Gd	153.920876	2.18	155Gd	154.822629	14.8	156Gd	155.92213	20.47	157Gd	156.923967	15.65	158Gd	157.924111	24.84	160Gd	159.927061	21.86
Terbium	65	159Tb	158.92535	100
Dysprosium	66	156Dy	155.924287	0.06	158Dy	157.924412	0.1	160Dy	159.925203	2.34	161Dy	160.926939	18.9	162Dy	161.926805	25.5	163Dy	162.928737	24.9	164Dy	163.929183	28.2
Holmium	67	165Ho	164.930332	100
Erbium	68	162Er	161.928787	0.14	164Er	163.929211	1.61	166Er	165.930305	33.6	167Er	166.932061	22.95	168Er	167.932383	26.8	170Er	169.935476	14.9
Thulium	69	169Tm	168.934225	100
Yiterbium	70	168Yb	167.933908	0.13	170Yb	169.934774	3.05	171Yb	170.936338	14.3	172Yb	171.936393	21.9	173Yb	172.938222	16.12	174Yb	173.938873	31.8	176Yb	175.942576	12.7
Lutetium	71	175Lu	174.940785	97.4	176Lu	175.942694	2.6
Hafnium	72	174Hf	173.940065	0.16	176Hf	175.94142	5.2	177Hf	176.943233	18.6	178Hf	177.94371	27.1	179Hf	178.945827	13.74	180Hf	179.946561	35.2
Tantalum	73	180Ta	179.947489	0.012	181Ta	180.948014	99.99
Tungsten	74	180W	179.946727	0.13	182W	181.948225	26.3	183W	182.950245	14.3	184W	183.950953	30.67	186W	185.954377	23.6
Rhenium	75	185Re	184.952977	37.4	187Re	186.955765	62.6
Osmium	76	184Os	183.952514	0.02	186Os	185.953852	1.58	187Os	186.955762	1.6	188Os	187.95585	13.3	189Os	188.958156	16.1	190Os	189.958455	26.4	192Os	191.961487	41
Iridium	77	191Ir	190.960603	37.3	193Ir	192.962942	62.7
Platinum	78	190Pt	189.959937	0.01	192Pt	191.961049	0.79	194Pt	193.962679	32.9	195Pt	194.964785	33.8	196Pt	195.964947	25.3	198Pt	197.967879	7.2
Gold	79	197Au	196.96656	100
Mercury	80	196Hg	195.965812	0.15	198Hg	197.96676	10.1	199Hg	198.968269	17	200Hg	199.968316	23.1	201Hg	200.970293	13.2	202Hg	201.970632	29.65	204Hg	203.973481	6.8
Thallium	81	203Tl	202.972336	29.52	205Ti	204.97441	70.48
Lead	82	204Pb	203.973037	1.4	206Pb	205.974455	24.1	207Pb	206.975885	22.1	208Pb	207.976641	52.4
Bismuth	83	209Bi	208.980388	100
Polonium	84	209Po	209	100
Astatine	85	210At	210	100
Radon	86	222Rn	222	100
Francium	87	223Fr	223	100
Radium	88	226Ra	226	100
Actinium	89	227Ac	227	100
Thorium	90	233Th	232.038054	100
Protoactinium	91	231Pa	231	100
Uranium	92	234U	234.040947	0.006	235U	235.043925	0.72	238U	238.050786	99.27