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sexvalent
sexvalent adj. 
/sɛksˈveɪln̩t/,
Brit. /sɛksˈveɪlənt/
, /sɛksˈveɪlənt//sɛksˈveɪln̩t/U.S. /sɛksˈveɪlənt/
Chemistry having a valency of six; = hexavalent adj.; cf. sexivalent adj./sɛksˈveɪlənt/ΘΚΠ
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sexivalent1867
hexatomic1868
sexvalent1868
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) ii. 233 Sulphur,..which is sexvalent in sulphur trioxide, SO3, is quadrivalent in sulphur dioxide, SO2.
1912 A. H. Phillips Mineralogy ii. i. 230 In the sexvalent state the sulphates, molybdates, chromates, and tungstates are very closely related.
1970 Jrnl. Physics & Chem. Solids 31 723/2 For formation of compounds in such a model, the entropy change due to changes in free-electron concentrations ranges in value from −2 e.u. for divalent Cd and Ca to −4 e.u. for sexvalent U.
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