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Helium - Wikipedia
Helium (from Ancient Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.Helium - Element information, properties and uses | Periodic Table
Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.Helium Facts - Atomic Number 2 or He - Science Notes and Projects
Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table.Helium (He) - Periodic Table
Helium (He) Helium is the 2nd element in the periodic table and has a symbol of He and atomic number of 2. It has an atomic weight of 4.00260 and a mass number of 4. Helium has two protons and two neutrons in its nucleus, and two electrons in one shell. It is located in group eighteen, period one and block s of the periodic table.Atomic Number of Helium He
Atomic Number of Helium is 2. Chemical symbol for Helium is He. Number of protons in Helium is 2. Atomic weight of Helium is 4.002602 u or g/mol. Melting point of Helium is -272,2 °C and its the boiling point is -268,9 °C.Helium | He (Element) - PubChem
Periodic Table Helium Helium is a chemical element with symbol He and atomic number 2. Classified as a noble gas, Helium is a gas at 25°C (room temperature).Periodic Table of Elements: Los Alamos National Laboratory
While helium normally has a 0 valence, it seems to have a weak tendency to combine with certain other elements. Means of preparing helium difluoride have been studied, and species such as HeNe and the molecular ions He+ and He++ have been investigated.Helium (He) - Periodic Table
Helium is a chemical element of the periodic table with chemical symbol He and atomic number 2 with an atomic weight of 4.0026 u and is classed as a noble gas.© 2008 - Mentions légales [ Modifiez votre fiche ] [ Inscrivez une fiche ]