Helium (He) - Physical & Chemical Properties, Uses, Isotopes
Helium (He) - Physical & Chemical Properties, Uses, Isotopes
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Evidence of helium was first observed on this day in 1868 by French astronomer Pierre Janssen during a total solar eclipse. ☀️ Take a look at helium atoms forming in this amazing cloud chamber, as Christmas Lecturer Peter Wothers demonstrates. | Royal Institution of Great Britain
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