Periodic Table of Chemical Elements

2019 is the International Year of the Periodic Table of Chemical Elements (IYPT 2019)!

Let's get ready to celebrate!

Countdown to IYPT!

At the American Chemical Society (ACS), our vision is to improve people’s lives through the transforming power of chemistry. Next year marks the 150th anniversary of the publication of Mendeleev’s Periodic Table of Chemical Elements (1869). In celebration of this momentous occasion, the United Nations Educational, Scientific, and Cultural Organization (UNESCO) officially proclaimed 2019 as “The United Nations International Year of The Periodic Table of Chemical Elements,” or "IYPT 2019."

ACS and chemical societies around the world will be celebrating throughout the year. IYPT celebrations will include contests, technical programming, themed gifts and giveaways, public engagement campaigns, and more.

The mission of the ACS is to advance the broader chemistry enterprise and its practitioners for the benefit of Earth and its people. Join us as we show how chemical elements are central to "linking cultural, economic and political aspects of the global society through a common language, whilst also celebrating the genesis and development of the periodic table over the last 150 years." Learn more.

Register Your Event

Submit information about your IYPT-related
events here!

Educational Resources




I’m an old antibiotic that has a new lease on life.

Chemical Elements History Timeline

Interactive Periodic Tables from Around the Web

International Union of Pure and Applied Chemistry


Royal Society of Chemistry (RSC)

Fast Facts, By The Numbers


Atomic Number for Mendelevium, Named After Mendeleev


Elements of the Periodic Table


Elements Named After 16 Scientists,
Including Mendeleev

Donna Nelson

Did You Know?

To help the TV show "Breaking Bad" get its science-related 'elements' right, 2015 ACS President Donna Nelson served as its science advisor. The show's stylized title uses the periodic table elements Br (bromine) and Ba (barium).

Get Involved

Join the Conversation

Use the hashtag #IYPT2019 on Twitter, Facebook and Instagram!

Plan an Event or Activity

Whether you are an active ACS member, teacher, volunteer, or student, you can plan events in your community to join the year-long celebration. Here are some general tips from ACS Local Sections, Student Chapters and ChemClubs to inspire you and help you launch your event! Don't forget to tell us about your event!

  • Plan your event far in advance.
  • Reach out to local museums, science centers, libraries, schools, and other science-related organizations.
  • Offer food and refreshments (Check out these periodic table-inspired cupcakes made by a ChemClub).
  • Publicize your event. Spread the word via websites, social media, newsletters, and more.

Download a Free Updated Periodic Table From ACS 
Is the periodic table hanging in your lab, classroom, or office woefully out of date? Replace that old relic with a free updated periodic table from ACS Publications!