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What is the atomic mass of helium?

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Quick Answer

Helium has an atomic mass of 4.00 atomic mass units. The gaseous element also has an atomic number of 2 and an atomic symbol of He. Its atomic number correlates with the number of protons and electrons the element has, while the element's neutrons can be determined from its mass.

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Full Answer

Helium has exactly two protons and two electrons; it has an atomic number of 2. It also has two neutrons, as its atomic mass minus its atomic number equals two. The element is classified as a noble gas and is found in group 18 on the periodic table. It is an inert atom because it has eight valence electrons and is completely stable.

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