One of the mysteries of the English language finally explained.
- another term for heptavalent
- ‘Vanadium oxides that are in the higher oxidation state, e.g. pentavalent and septavalent oxides of vanadium and complexes thereof have melting points from about 1,200° to about 1,300° F.’
- ‘In general, manganese ions are found in different valence states from divalent to septavalent.’
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