Which of the following properties is generally not shown by metals?

Generally,metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

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.

Which of the following metals is used for making jewelry?

Write the atomic numbers of two elements $X$ and $Y$ having electronic configurations $2, 8, 2$ and $2, 8, 6$ respectively.

In which state does the element phosphorus exist at room temperature?