Hydrogen
3.0 Dihydrogen
3.0 Dihydrogen
Occurrence
Dihydrogen is the most abundant element in the universe ($70%$ of the total mass of the universe) and is the principal element in the solar atmosphere. The giant planets Jupiter and Saturn consist mostly of hydrogen. However, due to its light nature, it is much less abundant ($0.15%$ by mass) in the earth’s atmosphere. Of course, in the combined form it constitutes $15.4%$ of the earth's crust and the oceans. In the combined form besides in water, it occurs in plant and animal tissues, carbohydrates, proteins, hydrides including hydrocarbons and many other compounds
