Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!

Explore how atomic mass changes with atomic number in the periodic table of elements via interactive plots.

Explore how atomic radius changes with atomic number in the periodic table of elements via interactive plots.

Chemical element, Nitrogen, information from authoritative sources. Look up properties, history, uses, and more.

Chemical element, Polonium, information from authoritative sources. Look up properties, history, uses, and more.

Chemical element, Boron, information from authoritative sources. Look up properties, history, uses, and more.

Chemical element, Aluminum, information from authoritative sources. Look up properties, history, uses, and more.

Periodic Table element Summary Helium. Helium is a chemical element with symbol He and atomic number 2. Classified as a noble gas, Helium is a gas at room temperature.

Chemical element, Xenon, information from authoritative sources. Look up properties, history, uses, and more.

Hydrogen is a commercially important element. Large amounts of hydrogen are combined with nitrogen from the air to produce ammonia (NH 3) through a process called the Haber process. Hydrogen is also added to fats and oils, such as peanut oil, …