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Helium. Element 2 of the periodic table of chemical elements. Oxygen helium nitrogen argon pipes in a research labaoratory Helium periodic table element chemistry symbol. Vector helium atom gas icon The inert gas Helium (He) seen in a discharge tube emits light due to an electric field. He symbol. Helium chemical element Helium. Noble gases. Chemical Element of Mendeleev's Periodic Table. Helium in square cube creative concept. Row of liquefied helium industrial gas containers Helium tank with compressed helium inflating colored balloons for celebration or party. Young boy holding a bunch of helium filled balloons 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 Multi colored helium balloons on white background.