Rigel 
Hydrogen is the first element in the periodic table. It is the simplest possible atom composed of one proton in the nucleus which is orbited by a single electron. Hydrogen is the lightest of the elements and is the most abundant element in the universe.
The element hydrogen
Symbol: H
Atomic Number: 1
Atomic Weight: 1.00794
Classification: Nonmetal
Phase at Room Temperature: Gas
Density: 0.08988 g/L @ 0°C
Melting Point: -259.14°C, -434.45°F
Boiling Point: -252.87°C, -423.17°F
Discovered by: Henry Cavendish in 1766
Characteristics and Properties
At standard temperature and pressure hydrogen is a colorless, odorless, and tasteless gas.
Hydrogen is very flammable and burns with an invisible flame. It burns when it comes into contact with oxygen. The byproduct of a hydrogen and oxygen explosion is water or H2 O.
Hydrogen gas is made up of diatomic molecules designated as H2.
About The Author
Doyen Altair 
Aurora