150 years of chemistry’s periodic table is celebrated by UNESCO

UNESCO – Image Credits Wikimedia

The periodic table of chemical elements is one of the most major achievements in science. It is a unique tool, allows scientist to predict the emergence and properties of matter on the Earth and in the rest of the universe.

In the 19th century, many scientists worked together to form the periodic table that arranged all the elements according to the atomic weight. In 1869, Russian chemistry professor Dmitri Mendeleev first published the periodic table. He organized the 63 known elements into groups with similar properties and left some spaces blank for those whose existence he could not prove.

In 1913, physicist Henry Moseley’s experiment showed that the order in the periodic table was not dependent on atomic weight but on the atomic number- the number of protons in an atom’s nucleus.

On Tuesday 2019, The UN Education, Scientific and cultural organization celebrated the “International Year of the Period Table of Chemical Elements” with a grand ceremony that included a Nobel chemistry laureate and Russia’s science minister.

One who studied chemistry will able to recognize the table, which organizes all chemical elements by the number of protons in a given atom and other properties. Among the other activities UNESCO is organizing this year an online competition to find out high school students knowledge of the table, and scientific research brought to schools around the globe.


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