Table 3.4: Biologically important nuclei giving NMR signals

Nucleus

Natural abundance (% by weight of the element)

1H

99.984

2H

  0.016

13C

  1.108

14N

99.635

15N

  0.365

17O

  0.037

23Na

100.0       

25Mg

10.05   

31P

100.0       

35Cl

75.4     

39K

93.1