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!

Periodic Table element Summary Chlorine. Chlorine is a chemical element with symbol Cl and atomic number 17. Classified as a halogen, Chlorine is a gas at room temperature.

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

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.

Periodic Table element Summary Uranium. Uranium is a chemical element with symbol U and atomic number 92. Classified as an actinide, Uranium is a solid at room temperature.

Periodic Table element Summary Hydrogen. Hydrogen is a chemical element with symbol H and atomic number 1. Classified as a nonmetal, Hydrogen is a gas 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.

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 Sulfur. Sulfur is a chemical element with symbol S and atomic number 16. Classified as a nonmetal, Sulfur is a solid at room temperature.

Periodic Table element Summary Livermorium. Livermorium is a chemical element with symbol Lv and atomic number 116. Classified as a post-transition metal, Livermorium is a expected to be a solid at room temperature.