| Name | Formula | Dipole moment (debye) |
|---|---|---|
| arachno-tetraborane(10) | H10B4 | 0.49 |
| argon | Ar | 0.00 |
| arsenic tribromide | AsBr3 | 1.66 |
| arsenic trichloride | AsCl3 | 1.59 |
| arsenic trifluoride | AsF3 | 2.59 |
| arsenic triiodide | AsI3 | 0.96 |
| arsenic trioxide | As2O3 | 0.14 |
| arsenobenzene | C12H10As2 | 0.00 |
| arsine | H3As | 0.20 |
| azepan-2-one | C6H11NO | 3.88 |
| azidobenzene | C6H5N3 | 1.55 |
| azidocyclohexane | C6H11N3 | 2.39 |
| azidoethane | C2H5N3 | 2.12 |
| azidomethane | CH3N3 | 2.17 |
| aziridine | C2H5N | 1.89 |
| azobenzene | C12H10N2 | 0.52 |
| azobenzene-2-sulfenyl bromide | C12H9BrN2S | 6.34 |
| azobenzene-2-sulfenyl chloride | 6.02 | |
| azobenzene-2-sulfenyl cyanide | 3.64 | |
| azobenzene-2-sulfenyl iodide | 6.75 | |
| azothiobenzene | 1.15 | |
| azoxybenzene | C12H10N2O | 1.80 |
| azulene | C10H8 | 0.80 |
| b-(2-methoxycyclopentyl)mercury bromide | 4.70 | |
| b-(2-methoxycyclopentyl)mercury chloride | 4.10 |