| Answer | Crossword Clue |
|---|---|
| tetravalent | a compound having a valency of four |
| tetravalents | TETRAVALENT, a compound having a valency of four |
| multivalent | having multiple valency / a compound with multiple valency also POLYVALENT |
| pyrrolic | a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (as bile pigments, porphyrins, and chlorophyll) |
| multivalents | MULTIVALENT, a compound with multiple valency also POLYVALENT |
| univalent | having a valency of one, capable of combining with one atom of hydrogen or its equivalent / a univalent radical |
