apr 22, 1913 - Henry Moseley - Rearrangement of Periodic Table (1913)
Description:
Moseley discovers a more effective way to group elements on the periodic table based on the number of protons an element has in its nucleus. This number is known as an element's atomic number. Moseley also predicted four undiscovered elements which were found in later years.Added to timeline:
Date:
apr 22, 1913
Now
~ 112 years ago