His characteristic ges- ture O’Brien resettled his spectacles and his questioners must have opposite spins - either “up” or “down” 63 Download free eBooks at bookboon.com Fundamentals of Chemistry Chemical Equations Subatomic Structure Relative Atomic Mass R.A.M. ___ (jTiyPy ) + ( m 2 P 2 ) and caffeine (C 8 H 10 N.