Specialty Medical Coding Certification. 1  Hematology and Oncology â CHONCâ¢. 2  Internal Medicine â CIMCâ¢. 3  Interventional Radiology and Cardiovascular â CIRCCÂ®. 4  Obstetrics Gynecology â COBGCâ¢. 5  Ophthalmology â COPCâ¢. 6  Orthopaedic Surgery â COSCâ¢. 7  Otolaryngology â CENTCâ¢. 8  Pediatrics â CPEDCâ¢. FREE Practice Exam & Study Guide through Aug 31st.
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds (notably oxides) with most elements. Photosynthesis releases oxygen, and respiration consumes oxygen.
Oxygen is the third most abundantly found element in the universe. It is naturally found in the sun and plays a vital role in the stellar carbon cycle. Being the first member of Group 16 of the periodic table, oxygen is a chemically active element, forming compounds with nearly all the elements except the inert gases.he natural oxygen in the atmosphere called diatomic oxygen gas has a molecular mass of 32 while ozone (O 3), which is more reactive than natural oxygen, is another allotrope of oxygen formed due to electrical discharges, or ultraviolet light reacting with the atmospheric oxygen.