Assertion: magnesium | /r/HasProperty | discovered as unique element
Facets:
value: by sir humphrey davy
type: OTHER
value: in 1808
type: TEMPORAL
Source sentences:
text: Magnesium was discovered as a unique element in 1808 by Sir Humphrey Davy but not produced in metallic form until 1831 when Antoine Bussy made magnesium during an experiment with dehydrated magnesium chloride.