Stable Isotopes

The following table contains a list of known stable isotopes, ordered according to their atomic number and their nominal mass. Elements with only one stable isotope are in bold faces.

atomic number	symbol	natural abundance(%)
1	H	1: 99.9855 2: 0.0145
2	He	3: 0.000137 4: 99.999863
3	Li	6: 7.42 7: 92.58
4	Be	9: 100.0
5	B	10: 19.905 11: 80.095
6	C	12: 98.892 13: 1.108
7	N	14: 99.6337 15: 0.3663
8	O	16: 99.7587 17: 0.0374 18: 0.2039
9	F	19: 100
10	Ne	20: 90.514 21: 0.266 22: 9.220
11	Na	23: 100
12	Mg	24: 78.992 25: 10.003 26: 11.005
13	Al	27: 100
14	Si	28: 92.21 29: 4.70 30: 3.09
15	P	31: 100
16	S	32: 95.018 33: 0.750 34: 4.215 36: 0.017
17	Cl	35: 75.7705 37: 24.2295
18	Ar	36: 0.337 38: 0.063 40: 99.600
19	K	39: 93.083 40: 0.012 41: 6.905
20	Ca	40: 96.92 42: 0.64 43: 0.123 44: 2.13 46: 0.0032 48: 0.179
21	Sc	45: 100
22	Ti	46: 7.99 47: 7.32 48: 73.99 49: 5.46 50: 5.25
23	V	50: 0.24 51: 99.76
24	Cr	50: 4.3452 52: 83.7895 53: 9.5006 54: 2.3647
25	Mn	55: 100
26	Fe	54: 5.82 56: 91.66 57: 2.19 58: 0.33
27	Co	59: 100
28	Ni	58: 67.76 60: 26.16 61: 1.25 62: 3.66 64: 1.16
29	Cu	63: 69.174 65: 30.826
30	Zn	64: 48.89 66: 27.81 67: 4.11 68: 18.57 70: 0.62
31	Ga	69: 60.16 71: 39.84
32	Ge	70: 20.52 72: 27.43 73: 7.76 74: 36.54 76: 7.76
33	As	75: 100
34	Se	74: 0.87 76: 9.02 77: 7.58 78: 23.52 80: 49.82 82: 9.19
35	Br	79: 50.686 81: 49.314
36	Kr	78: 0.354 80: 2.27 82: 11.56 83: 11.55 84: 56.90 86: 17.37
37	Rb	85: 72.15 87: 27.85
38	Sr	84: 0.560 86: 9.870 87: 7.035 88: 82.535
39	Y	89: 100
40	Zr	90: 51.46 91: 11.23 92: 17.11 94: 17.40 96: 2.80
41	Nb	93: 100
42	Mo	92: 15.84 94: 9.04 95: 15.72 96: 16.53 97: 9.46 98: 23.78 100: 9.63
44	Ru	96: 5.51 98: 1.87 99: 12.72 100: 12.62 101: 17.07 102: 31.63 104: 18.58
45	Rh	103: 100
46	Pd	102: 0.96 104: 10.97 105: 22.23 106: 27.33 108: 26.71 110: 11.81
47	Ag	107: 51.830 109: 48.170
48	Cd	106: 1.215 108: 0.875 110: 12.39 111: 12.75 112: 24.07 113: 12.26 114: 28.86 116: 7.58
49	In	113: 4.28 115: 95.72

atomic number	symbol	natural abundance(%)
50	Sn	112: 0.95 114: 0.65 115: 0.34 116: 14.24 117: 7.57 118: 24.01 119: 8.58 120: 32.97 122: 4.71 124: 5.98
51	Sb	121: 57.25 123: 42.75
52	Te	120: 0.089 122: 2.46 123: 0.87 124: 4.61 125: 6.99 126: 18.71 128: 31.79 130: 34.49
53	J	127: 100
54	Xe	124: 0.097 126: 0.090 128: 1.927 129: 26.49 130: 4.078 131: 21.21 132: 26.86 134: 10.41 136: 8.83
55	Cs	133: 100
56	Ba	130: 0.101 132: 0.097 134: 2.42 135: 6.59 136: 7.81 137: 11.32 138: 71.66
57	La	138: 0.089 139: 99.911
58	Ce	136: 0.193 138: 0.250 140: 88.48 142: 11.07
59	Pr	141: 100
60	Nd	142: 27.11 143: 12.17 144: 23.85 145: 8.30 146: 17.22 148: 5.73 150: 5.62
62	Sm	144: 3.09 147: 14.97 148: 11.24 149: 13.83 150: 7.44 152: 26.72 154: 22.71
63	Eu	151: 47.82 153: 52.18
64	Gd	152: 0.200 154: 2.15 155: 14.73 156: 20.47 157: 15.68 158: 24.87 160: 21.90
65	Tb	159: 100
66	Dy	156: 0.0524 158: 0.0902 160: 2.294 161: 18.88 162: 25.53 163: 24.97 164: 28.18
67	Ho	165: 100
68	Er	162: 0.136 164: 1.56 166: 33.41 167: 22.94 168: 27.07 170: 14.88
69	Tm	169: 100
70	Yb	168: 0.135 170: 3.03 171: 14.31 172: 21.82 173: 16.135 174: 31.84 176: 12.73
71	Lu	175: 97.41 176: 2.59
72	Hf	174: 0.18 176: 5.20 177: 18.50 178: 27.13 179: 13.75 180: 35.24
73	Ta	180: 0.0120 181: 99.9880
74	W	180: 0.14 182: 26.29 183: 14.31 184: 30.66 186: 28.60
75	Re	185: 37.07 187: 62.93
76	Os	184: 0.018 186: 1.59 187: 1.64 188: 13.3 189: 16.1 190: 26.4 192: 41.0
77	Ir	191: 37.3 193: 62.7
78	Pt	190: 0.0127 192: 0.78 194: 32.9 195: 33.8 196: 25.3 198: 7.21
79	Au	197: 100
80	Hg	196: 0.146 198: 10.02 199: 16.84 200: 23.13 201: 13.22 202: 29.80 204: 6.85
81	Tl	203: 29.50 205: 70.50
82	Pb	204: 1.4245 206: 24.1447 207: 22.0827 208: 52.3481
83	Bi	209: 100
90	Th	232: 100
92	U	234: 0.0056 235: 0.7205 238: 99.2739