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Celebrating the periodic table

Dmitri Mendeleev published his periodic system for classifying all the known elements 150 years ago. That system gave birth to the periodic table we've come to know and love. To celebrate this anniversary, the United Nations General Assembly and UN Educational, Scientific, and Cultural Organization proclaimed 2019 the International Year of the Periodic Table of Chemical Elements. C&EN is joining the celebration by releasing original content—features, videos, photos, and more—throughout 2019.

Announcing the "I Spy a Periodic Table" photo contest results

In celebration of the International Year of the Periodic Table, we picked our top entries. Vote for your favorite and view all the submissions

The International Year of the Periodic Table officially kicks off in Paris

Opening ceremony features periodic tables galore, musical performances, and scientific talks

Sketch Chemistry: Knights of the Periodic Table

To see more Sketch Chemistry, visit

The periodic table is an icon. But chemists still can’t agree on how to arrange it

New data about the elements and their relationships have led to debate over the 150-year-old table’s optimum ordering

2019: The year the periodic table gets its due

Join C&EN as we celebrate 150 years of chemistry’s most iconic symbol

From our archives

To celebrate the International Year of the Periodic Table, C&EN is re-releasing its favorite essays from our 2003 collectors’ issue honoring the elements. Read the essay we release each month at the C&EN Archives site.

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