Assertion: oxygen | /r/HasProperty | believed
Facets:
value: commonly
type: DEGREE
Source sentences:
text: Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774.
text: In all of its compounds, oxygen assumes a negative oxidation state as is expected from the two half-filled outer orbitals.