Hydrogen and its Uses Hydrogen, the simplest element, it composed of one proton and one electron. It makes up more than 90% of the composition of the universe. More than 30% of the mass of the sun is atomic hydrogen. It is the third most abundant element in the earth's surface, and is found mostly in water. Under ordinary conditions, hydrogen is a colorless, odorless, tasteless, and nonpoisonous gas composed of diatomic molecules. When hydrogen is generated …showed first 75 words of 332 total…

…showed last 75 words of 332 total…