Helium: Difference between revisions
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Revision as of 02:02, 28 July 2008
Helium is a chemical element, having the chemical symbol He.
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Its atomic number (the number of protons) is 2. It has a Standard Atomic Weight of 4.002602(2), and is typically found as a gas in its elemental form.
Helium is considered to be a member of the "Noble gas" class of elements, has a boiling point of -268.93 °C , and a melting point of -272.2 °C .