Assertion: carbon's isotope | /r/HasProperty | atoms of the same element
Facets:
Source sentences:
text: Number of isotopes: 15 total; two stable isotopes, which are atoms of the same element with a different number of neutrons.
text: Isotopes are atoms of the same element, i.e. they have the same number of Protons and Electrons in the atom, but they have a different number of Neutrons in the nucleus, so they have different atomic masses.