N12

 
   

The abundance of elements in the human body is based on an estimate by Robert A. Freitas Jr., Foresight Institute:

http://www.foresight.org/Nanomedicine/Ch03_1.html#Sec31

In the above source, estimated number of atoms of a particular chemical element in the lean 70 kg male human body is given; the weight expressed abundance here is calculated upon this estimate.

 
  UPDATED : 2004-12-12

http://www.grabovrat.com/handbook/handbookH06g1.html