Which chemical property of potassium (K) distinguishes it from other alkali metals?

Potassium is the alkali metal with the lowest melting point, about 63 °C, which is lower than sodium’s 98 °C and much lower than the others. This means potassium can be melted with only a small amount of heat, unlike its heavier siblings that stay solid until much higher temperatures. Because of this, a pot of liquid potassium can be made at a relatively low temperature, which is useful for experiments that require a liquid alkali metal. For example, a laboratory can melt potassium in a small crucible using a simple hot plate, while sodium would need a hotter source. This distinctive melting behavior sets potassium apart from the other alkali metals.