Where does “hypervalency” come from?

hypervalency (English) comes from English valency, from Latin Valentia, from Latin -ia, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

hypervalency (English): A higher than normal valency (typically involving a transfer of the electrons from the central (hypervalent) atom to the nonbonding molecular orbitals which it forms with (usually more electronegative) ligands)

Definitions

  1. A higher than normal valency (typically involving a transfer of the electrons from the central (hypervalent) atom to the nonbonding molecular orbitals which it forms with (usually more electronegative) ligands)

Ancestry of “hypervalency”, step by step

hypervalency traces back through two separate lines of ancestry.

via English valency

StepLanguageWordMeaning
1EnglishvalencyThe number of edges connected to a vertex in a...
2LatinValentiahealth, vigour, bodily strength
3Latin-iaUsed to form a feminine abstract noun, usually...
4Latin-iusforming adjectives from nouns; nominative neuter...
5Proto-Italic-jōsForms comparative adjectives
6Proto-Indo-European-yósCreates adjectives from noun or verb stems

via English hyper

StepLanguageWordMeaning
1Englishhyperhyperactive; energetic; overly diligent;...
Every word from Proto-Indo-European -yós