What is helium atomicity?
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Helium is a chemical element with symbol He and its atomic number appearing in the periodic table is 2. The atomic number of an element is "the atomic numberof a chemical element (also known as its proton number) is the number of protons found in the nucleus of an atom of that element number of protons."
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Helium is a chemical element with symbol He and its atomic number appearing in the periodic table is 2. The atomic number of an element is "the atomic numberof a chemical element (also known as its proton number) is the number of protons found in the nucleus of an atom of that element number of protons."
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Answer:Helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).
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