Hydrogen has one proton, one electron and no neutrons. Its symbol on the table of elements is "H," and it has an atomic number of 1. Hydrogen is found in ammonia, hydrochloric acid and water. Besides being abundant on Earth, it is also present in great quantities in stars like the sun and in gas planets such as Jupiter.
Besides the gas phase, hydrogen has two other phases. Solid hydrogen is made when hydrogen gas is cooled to a temperature below its melting point. Hydrogen can be turned into a liquid by cooling it to temperatures below -423.17 degrees Fahrenheit.Learn more about States of Matter