ATOMIC_HYDROGEN (1.0) /* H */ MOLECULAR_HYDROGEN (2.0) /* H2 */ HELIUM (4.0) /* He */ ATOMIC_NITROGEN (14.0) /* N */ ATOMIC_OXYGEN (16.0) /* O */ METHANE (16.0) /* CH4 */ AMMONIA (17.0) /* NH3 */ WATER_VAPOR (18.0) /* H2O */ NEON (20.2) /* Ne */ MOLECULAR_NITROGEN (28.0) /* N2 */ CARBON_MONOXIDE (28.0) /* CO */ NITRIC_OXIDE (30.0) /* NO */ MOLECULAR_OXYGEN (32.0) /* O2 */ HYDROGEN_SULPHIDE (34.1) /* H2S */ ARGON (39.9) /* Ar */ CARBON_DIOXIDE (44.0) /* CO2 */ NITROUS_OXIDE (44.0) /* N2O */ NITROGEN_DIOXIDE (46.0) /* NO2 */ OZONE (48.0) /* O3 */ SULPHUR_DIOXIDE (64.1) /* SO2 */ SULPHUR_TRIOXIDE (80.1) /* SO3 */ KRYPTON (83.8) /* Kr */ XENON (131.3) /* Xe */