Helium: Difference between revisions
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==Isotopes== | ==Isotopes== | ||
The helium atom has two stable [[isotope]]s, <sup>3</sup>H and <sup>4</sup>He. | The helium atom has two stable [[isotope]]s, <sup>3</sup>H and <sup>4</sup>He.[[Category:Suggestion Bot Tag]] | ||
Latest revision as of 17:01, 26 August 2024
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Helium is a chemical element, typically found as a gas in its elemental form. It has the chemical symbol He, atomic number (number of protons) Z = 2, and a standard atomic weight of 4.002602 g/mol.
Helium is a monatomic noble gas. At a pressure of 101.325 kPa, it has a boiling point of -268.93 °C, and a melting point of -272.2 °C. It is of relatively low density--see Benchmark quantities.
Isotopes
The helium atom has two stable isotopes, 3H and 4He.