Oxygen

hydrogen 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