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Information valid for O-16 unless otherwise noted

Basic Information

Symbol: O
Atomic Number: 8
Mass: 15.9994
Melting Point: -218.4 C
Boiling Point: -183.0 C
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

  1. First Energy Level: 2
    Second Energy Level: 6


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


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

Related Links

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  1. Chemical Of The Week -- Ozone