Oxygen was discovered by Joseph Priestley, Carl Scheele at 1774 in England, Sweden.
Origin of name: from the Greek words "oxy genes" meaning "acid" (sharp) and "forming" (acid former).
Atomic Number: 8
Atomic Weight: 15.9994
Melting Point: 54.36 K (-218.79°C or -361.82°F)
Boiling Point: 90.20 K (-182.95°C or -297.31°F)
Density: 0.001429 grams per cubic centimeter
Phase at Room Temperature: Gas
Element Classification: Non-metal
Period Number: 2 Group Number: 16 Group Name: Chalcogen