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

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!

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

Periodic Table element Summary Phosphorus Phosphorus is a chemical element with symbol P and atomic number 15. Classified as a nonmetal, Phosphorus is a solid at room temperature.

Periodic Table element Summary Iridium Iridium is a chemical element with symbol Ir and atomic number 77. Classified as a transition metal, Iridium is a solid at room temperature.

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

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

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

Periodic Table element Summary Europium Europium is a chemical element with symbol Eu and atomic number 63. Classified as a lanthanide, Europium is a solid at room temperature.

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