Hydrogen is the element made of 2 hydrogen molecules. Hydrogen is a gas in many common things. We see hydrogen every day and most of the time we don't even know. Hydrogen is the smallest molecule in the entire periodic table, which means it is the lightest. Some everyday things we use with hydrogen is of course water. Water is the chemical formula of 2 hydrogens and 1 oxygen. One of my favorite things to do on the weekend is to go out to the country and look at the beautiful stars. Well, what I am looking at is a giant exploding ball of gas made of mostly hydrogen and helium, which also means the sun is made of hydrogen. Hydrogen is also a very element being used in rocket fuel.