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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 7, 2026 · Helium is a chemical element, an inert gas of Group 18 (noble gases) of the periodic table. The second lightest element, helium is a colorless, odorless, and tastele.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^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, |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 +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). 1s 2. B. Cordero, V. Gómez, A.E. Platero-P