11. The presence of a catalyst such as e . g . arsenic can prolong that monatomic state. 12. This gives many solids about twice the atom-molar heat capacity at room temperature of monatomic gases. 13. The source of that high reactivity is the fact that such gases remain monatomic radicals for some time. 14. The specific heats of monatomic gases ( e . g ., helium ) are nearly constant with temperature. 15. This is why = } } for monatomic gases and = } } for diatomic gases at room temperature. 16. For moderate temperatures, the constant for a monatomic gas is = while for a diatomic gas it is =. 17. Under standard conditions, the noble gases are odorless, colorless, monatomic gases, with very low chemical reactivity. 18. One example is that someone can use the charge of an ion to find the oxidation number of a monatomic ion. 19. In monatomic perfect gases and, approximately, in most gases, temperature is a measure of the mean particle kinetic energy. 20. However, if they are real different monatomic species, then each will bind slightly differently with the water molecules during solvation.
