code: public int calculateNumberOfImplicitHydrogens(IAtom atom, IAtomContainer container) throws CDKException {
          return this.calculateNumberOfImplicitHydrogens(atom, container, false);
      }
docs: Calculate the number of missing hydrogens by subtracting the number of
  bonds for the atom from the expected number of bonds. Charges are included
  in the calculation. The number of expected bonds is defined by the AtomType
  generated with the AtomTypeFactory.
  
  @param  atom      Description of the Parameter
  @param  container Description of the Parameter
  @return           Description of the Return Value
  @see              AtomTypeFactory