Oxygen
Elem.
Total
Name
Atomic Mass
(g/mol)
Percentage
Mass
O
1
Oxgen
15.9994
100%
16
→ O
Total: 15.9994 (g/mol)
Oxygen element has 8 protons, 8 neutrons and 8 electrons. Oxygen gas is about 21% of the atmosphere,
and is essential for our respiration. Oxygen is widely existed in inorganic as well as organic compounds.
» Common Oxgen compounds:
• Water, H2O
• Oxygen Gas, O2
• Iron(III) Oxide, Fe2O3
• Silicon Oxide, SiO2
• Carbon Oxide, CO2
• Disulfur Pentaoxide, P2O5
• Sulfur Dioxide, SO2
• Calcium Oxide, CaO
