Assertion: carbon's isotope | /r/HasProperty | discovered
Facets:
Source sentences:
text: 23 isotopes of silicon have been discovered.
text: 32 isotopes of germanium have been discovered.
text: 40 isotopes of tin have been discovered.
text: 38 isotopes of lead have been discovered.
text: 6 isotopes of flerovium (flerovium-284, flerovium-285, flerovium-286, flerovium-287, flerovium-288, and flerovium-289) have been discovered.