code: def add_properties(props, mol):
      
      if not props:
          return
      # The properties supersedes all charge and radical values in the atom block
      for _, atom in mol.atoms_iter():
          atom.charge = 0
          atom.multi = 1
          atom.mass = None
      for prop in props.get("CHG", []):
          mol.atom(prop[0]).charge = prop[1]
      for prop in props.get("RAD", []):
          mol.atom(prop[0]).multi = prop[1]
      for prop in props.get("ISO", []):
          mol.atom(prop[0]).mass = prop[1]
docs: apply properties to the molecule object
  
      Returns:
          None (alter molecule object directly)