Assertion: natural calcium | /r/HasProperty | one isotope
Facets:
value: with a half-life
type: OTHER
Source sentences:
text: Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and 46Ca) and one isotope with a half-life so long that it can be considered stable for all practical purposes (48Ca, with a half-life of about 4.3 × 1019 years).