September 30, 2021
For educational institutions
Brenna Fleming: timeline
⟶ Updated 8 Dec 2017 ⟶
List of edits
5 Dec 2017
a total of 63 elements had been discovered up until this point
In 1817 Johann Dobereiner noticed that the atomic weight of strontium fell midway between the weights of calcium and barium, elements possessing similar chemical properties.
The law of Triad was created
Between 1829 and 1858 a number of scientists found that these types of chemical relationships extended beyond the triad.
John Newlands, an English chemist, wrote a paper in 1863 which classified the 56 established elements into 11 groups based on similar physical properties
Mendeleev's table became available to the scientific community via publication in 1869 before Meyer's appeared
Mendeleev developed his statement of the periodic law and published his work On the Relationship of the Properties of the Elements to their Atomic Weights in 1869.
In 1906, Mendeleev came within one vote of being awarded the Nobel Prize for his work.
Lord Rayleigh reported the discovery of a new gaseous element named argon which proved to be chemically inert.
Ernest Rutherford published studies of the scattering of alpha particles by heavy atom nuclei which led to the determination of nuclear charge.
About & Feedback