Hydrogen
The first element on the Periodic Table of Elements is Hydrogen . What is Hydrogen? *Hydrogen is considered a non-metal . It is usually found as a gas. *Hydrogen's atomic makeup consists of one proton and one electron. This makes hydrogen light in weight. It is lighter than air. *Hydrogen is one of the most abundant elements in the universe. Some of the common compounds that it is in are: H₂O: Water. This contains two hydrogen atoms and one oxygen atom. NH₄: Ammonia. Contains one nitrogen atom and four hydrogen atoms. CH₄: Methane. Contains one carbon atom and four hydrogen atoms. *Symbol: H *Atomic number: 1 *Atomic mass: 1.00794 Where is Hydrogen on the Table? It is the red box in the top left corner. It has Hydrogen's symbol on it.