Assertion: astatine's life | /r/HasProperty | the amount of time
Facets:
Source sentences:
text: Half life" is the amount of time it takes for a radioactive substance to decay to one half its initial mass.
text: Half life" is the amount of time it takes for a radioactive substance to decay to one half its initial mass.
text: Half life" is the amount of time it takes for a radioactive substance to decay to one half its initial mass.