Helium, atomic model. Chemical element and noble gas with symbol He and atomic number 2. Bohr model of helium-4, with atomic nucleus of 2 protons, 2 neutrons, and with 2 electrons in the atomic shell. premium vector by Furian

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table vector number element illustration isolated model symbol elements structure two education geometric chemical science composition chemistry shell gas research atom atomic electron neutron nucleus physics proton noble periodic helium configuration isotope orbital he structural white background Periodic Table chemical element atomic number noble gas element symbol atomic nucleus 222 electron configuration bohr model helium 4

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