Assertion: boron | /r/HasProperty | boron trioxide
Facets:
Source sentences:
text: Oxygen, carbon, and nitrogen react with boron in steel to form B 2 O 3 (boron trioxide); Fe 3 (CB) (iron boroncementite) and Fe 23 (CB) 6 (iron boroncarbide); and BN (boron nitride) respectively.