INTRODUCTION:
Oxygen is a chemical element with symbol O and atomic number 8 in
the periodic table of elements. It is a member of the chalcogen group
on the periodic table and is a highly reactive nonmetal and oxidizing
agent that readily forms compounds such as oxides with most elements.
Many major classes of organic molecules in living organisms contain
oxygen, such as proteins, nucleic acids, carbohydrates, and fats, as
do the major constituent inorganic compounds of animal shells, teeth,
and bone. Proteins: nucleic acids:
Carbohydrates: fats Most
of the mass of living organisms is oxygen as a component of water,
the major constituent of lifeforms. Oxygen is used in cellular
respiration and released by photosynthesis, which uses the energy of
sunlight to produce oxygen from water and carbon dioxide.
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