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, …

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 …

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 …

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 …

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 …

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).