code: private double getElementRank(String symbol) {
          for (int f = 0; f < rankedSymbols.length; f++) {
              if (rankedSymbols[f].equals(symbol)) {
                  return symbolRankings[f];
              }
          }
          IIsotope isotope = isotopeFac.getMajorIsotope(symbol);
          if (isotope.getMassNumber() != null) {
              return ((double) 800000 - isotope.getMassNumber());
          }
          return 800000;
      }
docs: Gets the element rank for a given element symbol as given in Bremser's
  publication.
  
  @param  symbol  The element symbol for which the rank is to be determined
  @return         The element rank