Periodic Table of Elements - PubChem
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!
Atomic Radius | Periodic Table of Elements - PubChem
The atomic radius of a chemical element is a measure of the size of its atom, usually, the distance from the center of the nucleus to the outermost isolated electron. Because an atom does not have a discrete boundary, there are various non-equivalent definitions of atomic radius, such as Van der Waals radius and covalent radius.
Antimony | Sb (Element) - PubChem
Molecules, atoms, and ions of the stable isotopes of antimony possess slightly different physical and chemical properties, and they commonly will be fractionated during physical, chemical, and biological processes, giving rise to variations in isotopic abundances and in atomic weights.
Yttrium | Y (Element) - PubChem
IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) Yttrium was discovered by Johan Gadolin, a Finnish chemist, while analyzing the composition of the mineral gadolinite ((Ce, La, Nd, Y) 2 FeBe 2 Si 2 O 10 ) in 1789.
Nitrogen | N (Element) - PubChem
IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) Nitrogen was discovered by the Scottish physician Daniel Rutherford in 1772. It is the fifth most abundant element in the universe and makes up about 78% of the earth's atmosphere, which contains an estimated 4,000 trillion tons of the gas.
Magnesium | Mg (Element) - PubChem
Periodic Table element Summary Magnesium. Magnesium is a chemical element with symbol Mg and atomic number 12. Classified as an alkaline earth metal, Magnesium is a solid at room temperature.
Atomic Mass | Periodic Table of Elements - PubChem
Explore how atomic mass changes with atomic number in the periodic table of elements via interactive plots.
Hydrogen | H (Element) - PubChem
Molecules, atoms, and ions of the stable isotopes of hydrogen possess slightly different physical and chemical properties and they are commonly fractionated during physical, chemical, and biological processes, giving rise to variations in isotopic abundances and in …
Electronegativity | Periodic Table of Elements - PubChem
Explore how electronegativity changes with atomic number in the periodic table of elements via interactive plots.
Ytterbium | Yb (Element) - PubChem
Fig. IUPAC.70.2: The insides of the National Institute of Standards and Technology’s (NIST) optical atomic clock. The red rings are magnetic coils and the red laser beam is an optical lattice. The intersecting violet lasers cool the ytterbium atoms.