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 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. Sources, facts, uses, scarcity (sri), podcasts, alchemical symbols, videos and images.
Helium, chemical element, inert gas of group 18 (noble gases) of the periodic table Helium is a chemical element with the symbol he and atomic number 2 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
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) Seven isotopes of helium are known
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