Question

which element was discovered on sun before it was discover on earth

Answer 1

The element helium with atomic number 2 was discovered on the sun before it was discovered on earth.  

Discovery: In the year 1868, a French astronomer named Pierre-Jules-Cesar Janssen was studying a total solar eclipse and was able to see a thin line that is yellow in color in the spectrum of the sun.

Naming: This element with a wavelength of 587.49 was named Helium by an English astronomer Lockyer.  

Facts: Helium was found to be the second most abundant element  in the universe.

Answer 2

Helium was first discovered on the surface of the sun.

Explanation:

• Helium was first discovered on the surface of the sun.
• The atomic number of helium is 2 and it has only one shell also known as valence shell.
• It was discovered by a French astronomer Pierre-Jules-Cesar Janssen in the year 1868.
• He saw a yellow-colored line along the spectrum of the sun. This line has a wavelength of 587.49 nm