Oxygen at Chemical Elements.com 


 

Basic Information


Name: Oxygen
Symbol: O
Atomic Number: 8
Atomic Mass: 15.9994 amu
Melting Point: -218.4 °C (54.750008 °K, -361.12 °F)
Boiling Point: -183.0 °C (90.15 °K, -297.4 °F)
Number of Protons/Electrons: 8
Number of Neutrons: 8
Classification: Non-metal
Crystal Structure: Cubic
Density @ 293 K: 1.429 g/cm3
Color: colorless


Atomic Structure

[Bohr Model of Oxygen]  
Number of Energy Levels: 2

    First Energy Level: 2
    Second Energy Level: 6

Isotopes

Isotope Half Life
O-15 122.2 seconds
O-16 Stable
O-17 Stable
O-18 Stable

Facts


Date of Discovery: 1774
Discoverer: Joseph Priestly
Name Origin: From the Greek words oxus (acid) and gennan (generate)
Uses: supports life
Obtained From: from liquid air