code: private IAtom findHydrogen(final IAtom[] atoms) {
          for (final IAtom a : atoms) {
              if (Integer.valueOf(1).equals(a.getAtomicNumber())) return a;
          }
          return null;
      }
docs: Given an array of atoms, find the first hydrogen atom.
  
  @param atoms array of non-null atoms.
  @return a hydrogen atom