| Symbol | Mass Number | Relative Atomic Mass | Isotopic Composition |
|---|---|---|---|
| 105Te | 105 | 104.94364(54)# | |
| 106Te | 106 | 105.93750(14) | |
| 107Te | 107 | 106.93501(32)# | |
| 108Te | 108 | 107.92944(11) | |
| 109Te | 109 | 108.927420(70) | |
| 110Te | 110 | 109.922410(60) | |
| 111Te | 111 | 110.921110(80) | |
| 112Te | 112 | 111.91701(18) | |
| 113Te | 113 | 112.915890(30) | |
| 114Te | 114 | 113.912090(30) | |
| 115Te | 115 | 114.911900(30) | |
| 116Te | 116 | 115.908460(30) | |
| 117Te | 117 | 116.908645(14) | |
| 118Te | 118 | 117.905828(16) | |
| 119Te | 119 | 118.906404(9) | |
| 120Te | 120 | 119.904020(10) | 0.0009(1) |
| 121Te | 121 | 120.904936(28) | |
| 122Te | 122 | 121.9030439(16) | 0.0255(12) |
| 123Te | 123 | 122.9042700(16) | 0.0089(3) |
| 124Te | 124 | 123.9028179(16) | 0.0474(14) |
| 125Te | 125 | 124.9044307(16) | 0.0707(15) |
| 126Te | 126 | 125.9033117(16) | 0.1884(25) |
| 127Te | 127 | 126.9052263(16) | |
| 128Te | 128 | 127.9044631(19) | 0.3174(8) |
| 129Te | 129 | 128.9065982(19) | |
| 130Te | 130 | 129.9062244(21) | 0.3408(62) |
| 131Te | 131 | 130.9085239(21) | |
| 132Te | 132 | 131.908553(7) | |
| 133Te | 133 | 132.910955(26) | |
| 134Te | 134 | 133.911369(11) | |
| 135Te | 135 | 134.91645(10) | |
| 136Te | 136 | 135.920100(50) | |
| 137Te | 137 | 136.92532(13) | |
| 138Te | 138 | 137.92922(22)# | |
| 139Te | 139 | 138.93473(43)# | |
| 140Te | 140 | 139.93885(32)# | |
| 141Te | 141 | 140.94465(43)# | |
| 142Te | 142 | 141.94908(64)# |