Expected headings
"Nuclear spin"
"Electron spin"
"Hydrogen, comprising approximately 10% of a human body by mass 3, with its single unpaired proton and no neutron, forms the basis of routine clinical MRI as it has a net spin of 1/2.Similarly, sodium-23 (11 protons, 12 neutrons) has a net spin of 1/2 and can, albeit with more difficulty, be used for MRI."