Assertion: argon | /r/HasProperty | last element
Facets:
value: in its period
type: TEMPORAL
Source sentences:
text: The reason Argon is the last element in its period is that it has the highest atomic number in its period, and that's the way all periods are arranged.
text: The reason Argon is the last element in its period is that it has the highest atomic number in its period, and that's the way all periods are arranged.