code: @Override
      public void addLonePair(ILonePair lonePair) {
          if (lonePairCount >= lonePairs.length) growLonePairArray();
          lonePairs[lonePairCount] = lonePair;
          ++lonePairCount;
          notifyChanged();
      }
docs: Adds a lone pair to this AtomContainer.
  
  @param  lonePair  The LonePair to added to this container