Trace Sciences International
162 Er
161.928775 (4)
0.14 (1)
oxide
22 – 39+
164 Er
163.929198 (4)
1.61 (3)
62 – 82+
166 Er
165.930290 (4)
33.6 (35)
96 – 98+
167 Er
166.932046 (4)
22.95 (17)
94 – 96+
168 Er
167.932368 (4)
26.8 (26)
98+
170 Er
169.935461(4)
14.9 (27)
97 – 98+
Erbium has six stable isotopes. Er-168 has a well established application for the production of Er-169 which is used in form of citrate for the treatment of rheumatoid arthritis.