Question

write a short note on the occurrence of hydrogen

Answer 1

Occurrence of Hydrogen(H₂) :
1. It is the most abundant element in the universe and about 92% of the universe is made of it.
2. However,abundance of H₂ is very low in the earth's atmosphere because earth's gravitational pull is too small to hold a very light element like it.
3. Some H₂ is found in volcanic eruptions though.
4. In contrast to atmosphere,earth's crust has H as the tenth most abundant element.
5. Earth's crust has 1520 ppm of hydrogen in it.