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.
In celebration of the International Year of the Periodic Table, we picked our top entries. Vote for your favorite and view all the submissions
Opening ceremony features periodic tables galore, musical performances, and scientific talks
New data about the elements and their relationships have led to debate over the 150-year-old table’s optimum ordering
Join C&EN as we celebrate 150 years of chemistry’s most iconic symbol