Give an example of a metal which:
$(i)$ is a liquid at room temperature.
$(ii)$ can be easily cut with a knife.
$(iii)$ is the best conductor of heat.
$(iv)$ is a poor conductor of heat.

(N/A) $(i)$ Metal that exists in a liquid state at room temperature $\to$ Mercury $(Hg)$.
$(ii)$ Metal that can be easily cut with a knife $\to$ Sodium $(Na)$ or Potassium $(K)$.
$(iii)$ Metal that is the best conductor of heat $\to$ Silver $(Ag)$.
$(iv)$ Metals that are poor conductors of heat $\to$ Mercury $(Hg)$ and Lead $(Pb)$.