January 31, 2020
For educational institutions
The Historical Development of the Period Table
⟶ Updated 13 days ago ⟶
List of edits
47 elements were discovered
John Newlands divided the new 53 elements into 11 groups.
Dimitri Mendeleev started the development of the periodic table.
Sir William Ramsay and Lord Rayleigh discovered noble gases.
J.J. Thomson discovered electrons.
Lord Rutherford announces that radioactivity is caused by the breakdown of an atom.
Rutherford discovered electrons orbit the nucleus.
Rutherford found protons in the nucleus. Rutherford turned a nitrogen atom to an oxygen atom for the first time. Henry Moseley gave us atomic numbers.
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