Assertion: period's element | /r/CapableOf | obey the madelung rule
Facets:
value: all period
type: TEMPORAL
value: completely
type: DEGREE
Source sentences:
text: All period 2 elements completely obey the Madelung rule; in period 2, lithium and beryllium fill the 2s subshell, and boron, carbon, nitrogen, oxygen, fluorine, and neon fill the 2p subshell.