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Old Monday, January 08, 2007
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Quote:
2. the most abundant element in the human body is :
a. Carbon b. Hydrogen c. Oxygen d. Nitrogen
By mass, human cells consist of 65-90% water (H2O), and a significant portion is composed of carbon-containing organic molecules. Oxygen therefore contributes a majority of a human body's mass, followed by carbon. 99% of the mass of the human body is made up of the six elements oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.


element abundance

Oxygen 65%

Carbon 18%

Hydrogen 10%

Nitrogen 3%

Calcium 1.5%

Phosphorus 1.0%

Potassium 0.35%

Sulfur 0.25%

Sodium 0.15%

Magnesium 0.05%

Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron 0.70%

Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine trace amounts



So janab the answer is neither Carbon nor hydrogen but Oxygen.

Found at: http://chemistry.about.com/cs/howthi...dyelements.htm

Reference: H. A. Harper, V. W. Rodwell, P. A. Mayes, Review of Physiological Chemistry, 16th ed., Lange Medical Publications, Los Altos, California 1977.
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Last edited by marwatone; Friday, June 22, 2012 at 04:04 AM. Reason: Red font color edited.
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