Periodic Table History

Johann Döbereiner

1817 - Johann Wolfgang Döbereiner, a German chemist, proposed the Law of Triads, which stated that certain groups of three elements had similar properties.

Newlands' Law of Octaves

In 1864, an English chemist John Alexander Newlands arranged the elements in the increasing order of their atomic masses (then called atomic weight). He observed that every eighth element had properties similar to the first element. Newlands called it the Law of Octaves.

Solving the puzzle of the periodic table

How did the periodic table of elements revolutionize our understanding of the world? What scientists contributed to the table we have today?

1864 - John Newlands, an English chemist, proposed the Law of Octaves, which stated that every eighth element had similar properties.

Lothar Meyer

1864 - Lothar Meyer, a German chemist, independently developed a periodic table based on the periodicity of properties as a function of atomic weights.

Dmitri Mendeleev

1869 - Dmitri Mendeleev, a Russian chemist, published his periodic table, which arranged the elements in order of increasing atomic weight and grouped them based on their similar properties. Mendeleev's table was the first to gain widespread acceptance and included predictions for unknown elements that were later confirmed.

Mendeleev’s Periodic Table

https://javalab.org/en/mendelephs-periodic-table-whiteboard/

Henry Moseley

1913 - Henry Moseley, an English physicist, discovered that the number of protons in an atom's nucleus (i.e., its atomic number) was the fundamental basis for the ordering of elements in the periodic table, which led to the modern periodic law.

Glenn T. Seaborg

1940s-1950s - Glenn T. Seaborg, an American chemist, discovered several new elements and rearranged the periodic table to include the actinide and lanthanide series.

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