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Helium. Element 2 of the periodic table of chemical elements. Helium periodic table element chemistry symbol. Vector helium atom gas icon Oxygen helium nitrogen argon pipes in a research labaoratory He symbol. Helium chemical element balloon Row of liquefied helium industrial gas containers Helium tank with compressed helium inflating colored balloons for celebration or party. Helium tank. Metal liquefied compressed helium gas container for filling or inflating Balloons good for birthday party, celebration Christmas holidays. Compact Helium tank. Red tank and blue balloon. Helium, 3D rendering of cubes of symbols of the elements of the periodic table, atomic number, atomic weight, name and symbol. Education, science and technology. 3D illustration Atomic number and mass number of ordinary atoms, using helium as an example. The atomic number (Z) is also the number of protons (np). The Mass number (A) is the total number of neutrons and protons. Helium He chemical element. 3D rendering Educational visualization page of helium atom