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UNESCO celebrates 150 years of periodic chemistry table

PARIS – The periodic table of chemical elements is completing 150 years, and the UN scientific agency is holding a year of events to celebrate.

Anyone who has studied chemistry will recognize the table, which organizes all chemical elements by the number of protons in a given atom and other properties. Russian scientist Dmitry Mendeleev published the first such table in 1969.

The United Nations Educational, Scientific and Cultural Organization launched the "International Year of the Periodic Table of Chemical Elements" on Tuesday with a ceremony that includes a Nobel Prize in chemistry and science minister of Russia, among other dignitaries.

Other activities that UNESCO is organizing this year include an online competition to test the knowledge of high school students on the table and scientific experiments taken to schools around the world.

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