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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 Helium tank with compressed helium inflating colored balloons for celebration or party. The inert gas Helium (He) seen in a discharge tube emits light due to an electric field. He symbol. Helium chemical element Row of liquefied helium industrial gas containers Helium. Noble gases. Chemical Element of Mendeleev's Periodic Table. Helium in square cube creative concept. balloon 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. Oxygen cylinder with compressed gas. Blue Oxygen tanks for industry. Factory festive, colorful balloons with helium attachment to the white ribbons