Assertion: atom | /r/HasAspect | low valence vacancy
Facets:
value: to electron ratios
type: OTHER
Source sentences:
text: From a chemical point of view, nonmetals may be divided into two classes: 1) covalent materials, which contain atoms having small sizes, high electronegativities, low valence vacancy to electron ratios, and a pronounced tendency to form negative ions in chemical reactions and negative oxidation states in their compounds; 2) ionic materials, which contain both small and large atoms.