Assertion: technetium | /r/HasProperty | t 1/2 = 4.2 x 10 6 years
Facets:
Source sentences:
text: Technetium has three long lived radioactive isotopes: 97 Tc (T 1/2 =2.6 x 10 6 years), 98 Tc (T 1/2 = 4.2 x 10 6 years) and 99 Tc (T 1/2 = 2.1 x 10 5 years).