Accurate Masses and natural abundance of isotopes
Based on 12C = 12.00000000

Isotope
Accurate Mass
Abundance (%)
 
Isotope
Accurate Mass
Abundance (%)
1-H
2-H
1.007825
2.014102
100.0000
0.0150
 
92-Mo
94-Mo
95-Mo
96-Mo
97-Mo
98-Mo
100-Mo
91.9068090
93.9050860
94.9058380
95.9046760
96.9060180
97.9054050
99.9074730
61.5002
38.3340
65.9760
69.1256
39.5773
100.0000
39.9088
3-He
4-He
3.01602929
4.00260325
0.0001
100.0000
 
96-Ru
98-Ru
99-Ru
100-Ru
101-Ru
102-Ru
104-Ru
95.9075960
97.9052870
98.9059370
99.9042180
100.905581
101.904348
103.905422
17.4684
5.9494
40.1899
39.8734
53.7975
100.0000
59.1772
6-Li
7-Li
6.01512320
7.01600450
8.1081
100.0000
 
103-Rh
102.905503
100.0000
9-Be
9.01218250
100.0000
 
102-Pd
104-Pd
105-Pd
106-Pd
108-Pd
110-Pd
101.905609
103.904028
104.905075
105.903475
107.903894
109.905169
3.7322
40.7611
81.7051
100.0000
96.8167
42.8833
10-B
11-B
10.0129380
11.0093053
24.8439
100.0000
 
107-Ag
109-Ag
106.905095
108.904754
100.0000
92.9050
12-C
13-C
12.000000000
13.0033548
100.0000
1.1122
 
106-Cd
108-Cd
110-Cd
111-Cd
112-Cd
113-Cd
114-Cd
116-Cd
105.906461
107.904186
109.903007
110.904182
111.902761
112.904401
113.903361
115.904758
4.3508
3.0978
43.4737
44.5527
83.9888
42.5339
100.0000
26.0703
14-N
15-N
14.0030740
15.0001090
100.0000
0.3673
 
113-In
115-In
112.904056
114.903875
4.4932
100.0000
16-O
17-O
18-O
15.9949146
16.9991306
17.9991594
100.0000
0.0381
0.2005
 
112-Sn
114-Sn
115-Sn
116-Sn
117-Sn
118-Sn
119-Sn
120-Sn
122-Sn
124-Sn
111.904823
113.902781
114.903344
115.901744
116.902954
117.901607
118.903310
119.902199
121.903440
123.905271
3.0864
2.1605
1.2346
45.3704
23.7654
75.0000
26.5432
100.0000
14.1975
17.2840
19-F
18.9984033
100.0000
 
121-Sb
123-Sb
120.903824
122.904222
100.0000
74.5201
20-Ne
21-Ne
22-Ne
19.9924391
20.9938453
21.9913837
100.0000
0.2983
10.1867
 
127-I
126.904477
100.0000
23-Na
22.9897697
100.0000
 
120-Te
122-Te
123-Te
124-Te
125-Te
126-Te
128-Te
130-Te
119.904021
121.903055
122.904278
123.902825
124.904435
125.903310
127.904464
129.906229
0.2840
7.6923
2.6864
14.2485
21.1243
56.0651
93.7574
100.0000
24-Mg
25-Mg
26-Mg
23.9850450
24.9858392
25.9825954
100.0000
12.6598
13.9380
 
124-Xe
126-Xe
128-Xe
129-Xe
130-Xe
131-Xe
132-Xe
134-Xe
136-Xe
123.906120
125.904281
127.903531
128.904780
129.903510
130.905080
131.904148
133.905395
135.907219
0.3717
0.3346
7.1004
98.1413
15.2416
78.8104
100.0000
38.6617
33.0855
27-Al
26.9815413
100.0000
 
133-Cs
132.905433
100.0000
28-Si
29-Si
30-Si
27.9769284
28.9764964
29.9737717
100.0000
5.0634
3.3612
 
130-Ba
132-Ba
134-Ba
135-Ba
136-Ba
137-Ba
138-Ba
129.906277
131.905042
133.904490
134.905668
135.904556
136.905816
137.905236
0.1478
0.1409
3.3710
9.1939
10.9540
15.6625
100.0000
31-P
30.9737634
100.0000
 
138-La
139-La
137.907114
138.906355
0.0901
100.0000
32-S
33-S
34-S
36-S
31.9720718
32.9714591
33.9678677
35.9670790
100.0000
0.7893
4.4306
0.0220
 
136-Ce
138-Ce
140-Ce
142-Ce
135.907140
137.905996
139.905442
141.909249
0.2147
0.2825
100.0000
12.5226
35-Cl
37-Cl
34.9688527
36.9659026
100.0000
31.9780
 
141-Pr
140.907657
100.0000
39-K
40-K
41-K
38.9637079
39.9639988
40.9618254
100.0000
0.0130
7.2170
 
142-Nd
143-Nd
144-Nd
145-Nd
146-Nd
148-Nd
150-Nd
141.907731
142.909823
143.910096
144.912582
145.913126
147.916901
149.920900
100.0000
44.8949
87.7258
30.5934
63.3616
21.2311
20.7888
36-Ar
38-Ar
40-Ar
35.9675456
37.9627322
39.9623831
0.3380
0.0630
100.0000
 
144-Sm
147-Sm
148-Sm
149-Sm
150-Sm
152-Sm
154-Sm
143.912003
146.914907
147.914832
148.917193
149.917285
151.919841
153.922218
11.6540
56.7670
42.4810
52.2560
27.8200
100.0000
84.9620
40-Ca
42-Ca
43-Ca
44-Ca
46-Ca
48-Ca
39.9625907
41.9586218
42.9587704
43.9554848
45.9536890
47.9525320
100.0000
0.6674
0.1393
2.1518
0.0041
0.1929
 
151-Eu
153-Eu
150.919860
152.921243
91.5709
100.0000
45-Sc
44.9559136
100.0000
 
152-Gd
154-Gd
155-Gd
156-Gd
157-Gd
158-Gd
160-Gd
151.919803
153.920876
154.922629
155.922130
156.923967
157.924111
159.927061
0.8052
8.7762
59.5813
82.4074
63.0032
100.0000
88.0032
46-Ti
47-Ti
48-Ti
49-Ti
50-Ti
45.9526330
46.9517650
47.9479470
48.9478710
49.9447860
10.8401
9.8916
100.0000
7.4526
7.3171
 
159-Tb
158.925350
100.0000
50-V
51-V
49.9471610
50.9439630
0.2510
100.0000
 
156-Dy
158-Dy
160-Dy
161-Dy
162-Dy
163-Dy
164-Dy
155.924287
157.924412
159.925203
160.926939
161.926805
162.928737
163.929183
0.2128
0.3546
8.2979
67.0212
90.4255
88.2978
100.0000
50-Cr
52-Cr
53-Cr
54-Cr
49.9460460
51.9405100
52.9406510
53.9388820
5.1915
100.0000
11.3379
2.8166
 
165.Ho
164.930332
100.0000
55-Mn
54.9380460
100.0000
 
162-Er
164-Er
166-Er
167-Er
168-Er
170-Er
161.928787
163.929211
165.930305
166.932061
167.932383
169.935476
0.4167
4.7917
100.0000
68.3036
79.7619
44.3452
54-Fe
56-Fe
57-Fe
58-Fe
53.9396120
55.9349390
56.9353960
57.9332780
6.3236
100.0000
2.3986
0.3053
 
169-Tm
168.934225
100.0000
58-Ni
60-Ni
61-Ni
62-Ni
64-Ni
57.9353470
59.9307890
60.9310590
61.9283460
63.9279680
100.0000
38.2305
1.6552
5.2585
1.3329
 
168-Yb
170-Yb
171-Yb
172-Yb
173-Yb
174-Yb
176-Yb
167.933908
169.934774
170.936338
171.936393
172.938222
173.938873
175.942576
0.4088
9.5912
44.9686
68.8679
50.6918
100.0000
39.9371
59-Co
58.9331980
100.0000
 
175-Lu
176-Lu
174.940785
175.942694
100.0000
2.6694
63-Cu
65-Cu
62.9295991
649277921
100.0000
44.5710
 
174-Hf
176-Hf
177-Hf
178-Hf
179-Hf
180-Hf
173.940065
175.741420
176.943233
177.943710
178.945827
179.946561
0.4545
14.7727
52.8409
76.9886
39.0341
100.0000
64-Zn
66-Zn
67-Zn
68-Zn
70-Zn
63.9291450
65.9260350
66.9271290
67.9248460
69.9253250
100.0000
57.4074
8.4362
38.6831
1.2346
 
180-Ta
181-Ta
179.947489
180.948014
0.0120
100.0000
69-Ga
71-Ga
68.9255810
70.9247010
100.0000
66.3890
 
180-W
182-W
183-W
184-W
186-W
179.946727
181.948225
182.950245
183.950953
185.954377
0.4239
85.7515
46.6254
100.0000
93.2507
70-Ge
72-Ge
73-Ge
74-Ge
75-Ge
69.9242500
71.9220800
72.9234640
73.9211790
75.9214030
56.1644
75.0685
21.3698
100.0000
21.3698
 
185-Re
187-Re
184.952977
186.955765
59.7444
100.0000
75-As
74.9215960
100.0000
 
184-Os
186-Os
187-Os
188-Os
189-Os
190-Os
192-Os
183.952514
185.953852
186.955762
187.955850
188.958156
189.958455
191.961487
0.488
3.8537
3.9024
32.4390
39.2683
64.3902
100.0000
79-Br
81-Br
78.9183360
80.9162900
100.0000
97.2776
 
191-Ir
193-Ir
191.960603
192.962942
59.4896
100.0000
74-Se
76-Se
77-Se
78-Se
80-Se
82-Se
73.9224770
75.9192070
76.9199080
77.9173040
79.9165210
81.9167090
1.8145
18.1451
15.3226
47.3790
100.0000
18.9516
 
190-Pt
192-Pt
194-Pt
195-Pt
196-Pt
198-Pt
189.959937
191.961049
193.962679
194.964785
195.964947
197.967879
0296
2.3373
97.3373
100.0000
74.8521
21.3018
78-Kr
80-Kr
82-Kr
83-Kr
84-Kr
86-Kr
77.9203970
79.9163750
81.9134830
82.9141340
83.9115060
85.9106140
0.6140
3.9474
20.3509
20.1754
100.0000
30.3509
 
197-Au
196.966560
100.0000
85-Rb
87-Rb
84.9117996
86.9091840
100.0000
38.5710
 
196-Hg
198-Hg
199-Hg
200-Hg
201-Hg
202-Hg
204-Hg
195.965812
197.966760
198.968269
199.968316
200.970293
201.970632
203.973481
0.5059
34.0641
57.3356
77.9089
44.5194
100.0000
22.9342
84-Sr
86-Sr
87-Sr
88-Sr
83.9134280
85.9092730
86.9088900
87.9056250
0.6781
11.9399
8.4766
100.0000
 
203-Tl
205-Tl
202.972336
204.974410
41.8922
100.0000
89-Y
88.9058560
100.0000
 
204-Pb
206-Pb
207-Pb
208-Pb
203.973037
205.974455
206.975885
207.976641
2.6718
45.9923
42.1756
100.0000
90-Zr
91-Zr
92-Zr
94-Zr
96-Zr
89.9047080
90.9056440
91.9050390
93.9063190
95.9082720
100.0000
21.9048
33.3822
33.6832
5.4033
 
209-Bi
208.980388
100.0000
93-Nb
92.9063780
100.0000
 
232-Th
232.038054
100.0000
       
234-U
235-U
238-U
234.040947
235.043925
238.050785
0.0055
0.7253
100.0000