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 …

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, …

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

Periodic Table element Summary Tennessine Tennessine is a chemical element with symbol Ts and atomic number 117. Classified as a halogen, Tennessine is a expected to be a solid at 25°C (room …

Periodic Table element Summary Plutonium Plutonium is a chemical element with symbol Pu and atomic number 94. Classified as a n actinide, Plutonium is a solid at 25°C (room temperature).

[285] United States Geological Survey. Resources on Isotopes-Periodic Table-Krypton, U.S. Geological Survey (2014), Feb. 26; http://wwwrcamnl.wr.usgs.gov/isoig/period/kr_iig.html.

https://www.nist.gov/pml/database-disclaimer Oxygen https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=8 IUPAC Periodic Table of the Elements and Isotopes (IPTEI) …

https://www.nist.gov/pml/database-disclaimer Lead https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=82 IUPAC Periodic Table of the Elements and Isotopes (IPTEI) …

On the basis of the Periodic System, Mendeleev predicted the existence of ekaboron, which would have an atomic weight between 40 of calcium and 48 of titanium. The element was discovered by Nilson in …

Periodic Table element Summary Cesium Cesium is a chemical element with symbol Cs and atomic number 55. Classified as a n alkali metal, Cesium is a solid at 25°C (room temperature).