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Helium atom

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A helium atom is the second lightest and second most abundant element in the universe, with the atomic number 2. It consists of two protons in its nucleus, which gives it its atomic number, along with two neutrons (in its most common isotope, helium-4) and two electrons surrounding the nucleus. **Key characteristics of helium:** 1. **Noble Gas:** Helium belongs to the group of noble gases on the periodic table.

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