by 
kaaka
ANSWERS: 1
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Depends which cell. http://www.encyclopedia.com/doc/1G2-3435100705.html says: "There is less than 1 mg of selenium in the average human body. The selenium is concentrated in the liver, kidneys, and pancreas. In males, selenium is also found in the testes and seminal vesicles" 1mg = 0.001g 0.001g x 78.96 g/mol = 0.00001266 mol no atoms per mole = 6.0221415×10^23 0.00001266 x 6.0221415×10^23 = Se atoms /body = 7.627 x 10^18 Se atoms /body no cells/body = 5x10^13 Se (atoms/body) / (cells/body) = atoms/cell = 7.627 x 10^18 / 5x10^13 = 152536 THis is just an approximation. Some people say 1x10^14 cells per body so could be half the above value (75000). Cells are concentrated in certain cells so could be 1000 in some and 300000 in others. Says less than 1mg and I have gone on 1mg assumption. Some resources I've ssen by googling "elemental composition of pancreas cells" measures the element concentration in milli-Moles per kg. As a comparison the above calc's give 0.00001266 mol per body, so 0.000159 milli-Moles per kg (thats nano-Moles/kg) definitely a trace element.
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