Assertion: magnesium | /r/HasProperty | element
Facets:
value: certainly
type: MANNER
Source sentences:
text: As you may remember from your high school chemistry class but probably don’t, magnesium is an element (atomic number 12!)
text: Its compounds are widely used in construction and medicine , and magnesium is one of the elements essential to all cellular life .
text: Magnesium is certainly one of these elements.
text: By 1800, chemists knew that magnesium was an element.
text: Although recognizing that it was an element took a while, compounds of magnesium have been known for a long time.