Hydrogen was discovered by Henry Cavendish at 1766 in London, England.
Origin of name: from the Greek words "hydro" and "genes" meaning "water" and "generator".
Atomic Number: 1
Atomic Weight: 1.00794
Melting Point: 13.81 K (-259.34°C or -434.81°F)
Boiling Point: 20.28 K (-252.87°C or -423.17°F)
Density: 0.00008988 grams per cubic centimeter
Phase at Room Temperature: Gas
Element Classification: Non-metal
Period Number: 1 Group Number: 1 Group Name: none