Assertion: oxygen | /r/HasProperty | chemical symbol o
Facets:
Source sentences:
text: Oxygen (chemical symbol O), the third most abundant element in the universe (after hydrogen and helium), is the most abundant element of the lithosphere (about 47% of Earth's crust), much of it oxides of silicon (e.g., silicon dioxide, SiO 2 : rocks, sand) and other elements.
text: Oxygen (chemical symbol O) has three naturally occurring isotopes: 16O, 17O, and 18O, where the 16, 17 and 18 refer to the atomic mass.