Thank you for bringing to my attention the recent International Union of Pure & Applied Chemistry report “Atomic weights of the elements 2009” (C&EN, Dec. 20 ...

How does one go about measuring the mass of an object? Mass is defined as the amount of matter an object contains. This is very different from weight, of course, as the mass of our object would remain ...

DISCUSSING the unit of atomic weight before Section A (Physics) at the meeting of the British Association in London on Sept. 28, Dr. F. W. Aston contrasted the point of view of the physicist and the ...

As the International Committee on Atomic Weights has not provided a table since 1921, the British Sub-Committee published in the Journal of the Chemical Society of January last a revised table of ...

For four years, James Chadwick was a prisoner of war in Germany. When World War I ended, he returned to his native England to rejoin the mentor of his undergraduate days, Ernest Rutherford. Now head ...

China’s super-thin rubidium atomic clock, which is just 17 millimeters thick, has been put into mass production, according to Xinhua News Agency. The clock, developed in 2018 by a research institute ...