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!
Hydrogen | H (Element) - PubChem
Hydrogen is a commercially important element. Large amounts of hydrogen are combined with nitrogen from the air to produce ammonia (NH 3) through a process called the Haber process.Hydrogen is also added to fats and oils, such as peanut oil, through a …
Atomic Mass | Periodic Table of Elements - PubChem
Atomic Mass in the Periodic Table of Elements. Cite. Download. Relative atomic mass is the ratio of the average mass of the atom to the unified atomic mass unit (symbol: u) or dalton (symbol: Da), which is defined as one twelfth of the mass of a carbon-12 atom in its ground state.
Thorium | Th (Element) - PubChem
IUPAC Periodic Table of the Elements and Isotopes (IPTEI) 9.3 Isotopes in Industry. The most precise time and frequency measurements are performed with optical atomic clocks that use as a frequency standard the optical frequency generated as electrons change energy levels. It has been proposed that a nuclear clock, using a nuclear transition ...
Antimony | Sb (Element) - PubChem
IUPAC Periodic Table of the Elements and Isotopes (IPTEI) 8.2 Isotopes in Industry. In the 1950s, 124 Sb and 125 Sb (with half-lives of 60 days and about 1000 days, respectively) were used commercially as tracers. They were injected into oil pipelines as a way to detect the residence time and flow rate of the substance through the pipeline.
Nitrogen | N (Element) - PubChem
IUPAC Periodic Table of the Elements and Isotopes (IPTEI) 7.3 Isotopes in Forensic Science and Anthropology Stable hydrogen, carbon, and nitrogen isotopic compositions are used to determine the origin of pseudoephedrine from seized methyl-amphetamine made from the pseudoephedrine (drug used as a nasal decongestant or as a stimulant) [91].
Atomic Radius | Periodic Table of Elements - PubChem
Atomic Radius in the Periodic Table of Elements. Cite. Download. 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 ...
Sulfur | S (Element) - PubChem
The name derives from the Latin sulphurium and the Sanskrit sulveri.Sulfur was known as brenne stone for "combustible stone" from which brim-stone is derived. It was known from prehistoric times and thought to contain hydrogen and oxygen. In 1809, the French chemists Louis-Joseph Gay-Lussac and Louis-Jacques Thenard proved the elemental nature of sulfur.
Electronegativity | Periodic Table of Elements - PubChem
Electronegativity in the Periodic Table of Elements. Cite. Download. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. Choose Elements to Display Plot of Electronegativity (Pauling Scale) vs Atomic Number ...
Tellurium | Te (Element) - PubChem
IUPAC Periodic Table of the Elements and Isotopes (IPTEI) 9.3 Isotopes Used as a Source of Radioactive Isotope(s) 120 Te is used for the production of 120g I, where “g” indicates ground state, via the 120 Te (p, n) 120g I reaction, which is used as a positron emission tomography (PET) and beta-emitting isotope [383], [384].