Assertion: noble gas's atom | /r/CapableOf | add electron
Facets:
value: to achieve the octet
type: PURPOSE
Source sentences:
text: Each noble-gas element is situated in the periodic table between an element of the most electronegative group, the halogen elements (Group 17, the atoms of which add electrons to achieve the octet and thereby become negative ions), and an element of the most electropositive group, the alkali metals (Group 1, the atoms of which lose electrons to become positive ions).