When was the periodic law first recognized?
Quick Answer
The periodic law was recognized in 1869 through the work of Dmitri Mendeleev and Julius Lothar Meyer. It showed that element properties repeat at regular intervals.
The Full Story
In 1869, Mendeleev and Meyer independently identified the periodic relationship among the elements. Mendeleev’s formulation became best known because it allowed him to predict missing elements and their properties. This was a major step in chemistry because it revealed that the elements were not just a random list of substances. Later, the law was refined when Henry Moseley showed in 1913 that atomic number, not atomic weight, determines the proper order of the table.
Key Facts
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