Which properties of mercury make it a good material to use in a thermostat

*The metal is relatively soft when compared to other transition metals, probably because the d electrons do not participate in calls.

*Melting points and boiling are very low.

*At room temperature, the fluid has an appreciable vapor pressure. Therefore, the exposed surfaces of mercury should always be covered to prevent evaporation and, consequently, the risk of poisoning.

hope this helps!

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.