code: public static int getHydrogenCount(IAtomContainer atomContainer, IAtom atom) {
          return getExplicitHydrogenCount(atomContainer, atom) + getImplicitHydrogenCount(atom);
      }
docs: The summed implicit + explicit hydrogens of the given IAtom.
  @param atomContainer
  @param atom
  @return The summed implicit + explicit hydrogens of the given IAtom.