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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, &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&May 18, 2015 · 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 ga%Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images..4 days ago · Ordinary air contains about 5 parts per million of helium, and Earth’s crust is only about 8 parts per billion. The nucleus of every helium atom contains two proton!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 !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