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1. Helium

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   Discovery and Etymology
   Helium was the first element to be discovered through spectroscopic analysis of a celestial body before it was found on Earth. In 1868, during a total solar eclipse, French astronomer Pierre Janssen observed a distinct yellow-green spectral line at a wavelength of 587.6 nm in the Sun's chromosphere, which could not be attributed to any known element on Earth 1. Concurrently, English astronomer Norman Lockyer independently observed the same line and attributed it to an unknown sola…