jul 5, 1914 - H.G.J. Moseley
Description:
Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass.Added to timeline:
Date:
jul 5, 1914
Now
~ 111 years ago