Assertion: period's element | /r/HasAspect | the most extreme properties
Facets:
value: often
type: TEMPORAL
value: in their respective groups
type: LOCATION
Source sentences:
text: The elements in period 2 often have the most extreme properties in their respective groups; for example, fluorine is the most reactive halogen, neon is the most inert noble gas, and lithium is the least reactive alkali metal.