AtomicProperties { public double getNormalizedElectronegativity(String symbol) { return this.getElectronegativity(symbol) / this.getElectronegativity("C"); } private  AtomicProperties(); double getVdWVolume(String symbol); double getNormalizedVdWVolume(String symbol); double getElectronegativity(String symbol); double getNormalizedElectronegativity(String symbol); double getPolarizability(String symbol); double getNormalizedPolarizability(String symbol); double getMass(String symbol); double getNormalizedMass(String symbol); static AtomicProperties getInstance();  }
@Test public void testGetNormalizedElectronegativity() throws Exception { AtomicProperties props = AtomicProperties.getInstance(); double eneg = props.getNormalizedElectronegativity("C"); Assert.assertTrue(eneg > 0); }