The discovery of Helium is on 1868 by Pierre Janssen, Per Teodor Cleve and Norman Lockyer. The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India.
OnAugust18,1868,Janssen managed to do just that. He become the first person to observe helium, an element never before seen on Earth, in the solar spectrum.
Scientific discoveries. The first evidence of helium was observed onAugust18,1868,as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer JulesJanssen during a total solar eclipse in Guntur,India.
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Answer:
1868
Explanation:
The discovery of Helium is on 1868 by Pierre Janssen, Per Teodor Cleve and Norman Lockyer. The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India.
Answer:
1868
On August 18, 1868, Janssen managed to do just that. He become the first person to observe helium, an element never before seen on Earth, in the solar spectrum.
Discoverers: Pierre Janssen, Per Teodor Cleve, Norman lockyer.
Atomic mass: 4.002602 u
Atomic number: 2
Scientific discoveries. The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India.