31. They are what chemists loosely call " atomic weights ." 32. In 1972, he moved to International Atomic Weights Commission where he served until 1987. 33. In 1906 Ostwald was elected a member of the International Committee on Atomic Weights . 34. The isotopes of erbium range in atomic weight from ( ) to ( ). 35. The stolen isotopes included at least 50 chemical elements in 228 different atomic weights . 36. This was followed by investigations of the atomic weights of arsenic and other elements. 37. Xenon propellant is used because of its high atomic weight and low ionization potential. 38. Langlet was the first to correctly define its atomic weight . 39. Stability of the oxyhalides decrease as the atomic weight of the component halide increases. 40. Their law was used for many years as a technique for measuring atomic weights .
