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'sun') is a chemical element It has symbol he and atomic number 2 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 Sources, facts, uses, scarcity (sri), podcasts, alchemical symbols, videos and images. Helium is a chemical element with the symbol he and atomic number 2 Helium, chemical element, inert gas of group 18 (noble gases) of the periodic table The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes. Chemical element helium has atomic number 2 A chemical symbol is a notation of one or two letters representing a chemical element. 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 Seven isotopes of helium are known Helium (he) 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 noble gas and is part of group 18. Periodic table element summary 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).