Helium-4 nucleus 4 2 He has been one of the main targets of experiments with positive result since the beginning of the CF research. There have been several data of helium-4 detection and these data have attracted researcher's interest very much despite difficulty of its measurement. 1-Thule Helium 2-Bike Hitch Rack, 2-lock cylinders with keys, all necessary straps and mounting hardware, and instruction guide and warranty information. Limited Lifetime Warranty. Thule will warranty all Thule brand car rack systems and its accessories manufactured by Thule during the time that an original retail purchaser owns the product. Helium was isolated by Sir William Ramsay and independently by N. Cleve at 1895 in London, England and Uppsala, Sweden. Atomic number: 2. Atomic weight: 4.0026. Group, period, block: 18, 1, s. Color: Colorless. APR2 1973 NationalBureauofStandards Library,E-OlAdmin.Bldg. OCT6 1981 191103 qc joo U57Q lV-O/ U.S. EPARTMENT OF COMMERCE National Bureau of Standards ThermophysicalProperties ofHelium-4from2to1500K withPressures to1000Atmospheres.
Helium was first discovered in the Sun. French astronomer Pierre Janssen in 1868 found proof that a new element existed in the Sun. He called the element helium. Helium was isolated by Sir William Ramsay and independently by N. A. Langley and P. T. Cleve at 1895 in London, England and Uppsala, Sweden.
Physical Properties
-457.96 °F
Atomic Properties
Electron Configuration
Isotopes
There are two of Helium, 3He, and 4He.
Helium-4, the most common isotope is produced on Earth.
4 2 Helium
Helium-3 is present on Earth only in trace amounts.