Assertion: technetium's life | /r/HasProperty | 4.2 million years
Facets:
Source sentences:
text: (half-life: 4.2 million years) and 99Tc (half-life: 211,100 years).
text: Technetium is so rare because the half-lives of 97Tc and 98Tc are only 4.2 million years.
text: (half-life: 4.2 million years) and 99Tc (half-life: 211,100 years).