Oxygen or O

• atomic number is 8

• atomic weight is 15.9994

• color is Colorless

• state at 298.15°k is Gas

• classification is Nonmetallic

• date of discovery is 1774

• density kg/m³ is 0.001429

• melting point is 50.5 K°

• boiling point is 165.03 K°

• group is Non-Metal

• Number of neutron is 8