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.

Periodic Table element Summary Xenon. Xenon is a chemical element with symbol Xe and atomic number 54. Classified as a noble gas, Xenon 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 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 Potassium. Potassium is a chemical element with symbol K and atomic number 19. Classified as an alkali metal, Potassium is a solid at room temperature.

Periodic Table element Summary Fluorine. Fluorine is a chemical element with symbol F and atomic number 9. Classified as a halogen, Fluorine is a gas 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 Arsenic. Arsenic is a chemical element with symbol As and atomic number 33. Classified as a metalloid, Arsenic is a solid at room temperature.

Periodic Table element Summary Nickel. Nickel is a chemical element with symbol Ni and atomic number 28. Classified as a transition metal, Nickel is a solid at room temperature.