The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 300C?

Li > Na > K > Rb > Cs . As the size increases interatomic attraction [Metallic bond strength] decreases and hence the energy required to break such bonds [attraction] decreasesTherefore, melting point decreases and "Cs" at room temperature [30°C] exists in liquid state→ Alkali metals due to their large size,  possess weak interatomic attraction and hence they possess low melting points