atomic theoryatomic unitsatomic weightatomizerattenuationattenuation coefficientattenuation constantattenuation factorattenuation lengthattenuation mean free pathattenuatorattraction forceattractive fieldattractive potentialauaufbau principleautoanalyzerautoclaveautoigintion pointautolysisautomatic balanceautomatic buretautomatic pipetautomatic titratorautooxidantautooxydationautoprotolysisauxiliary electrodeauxochromeavailable magnificationaverageaverage degree of polymerizationaverage deviationaverage erroraverage kinetic energyaverage lifeaverage molecular speedaverage reaction rateaverage valueaxial bondaxial ligationaxial rotation symmertyaxially symmetricaxisaxis of rotationaxis of symmeryaxisymmetricazeotropeazeotrope pointazeotropic mixture