Which of the following elements is a semiconductor?

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
$(i)$ Good thermal conductivity
$(ii)$ Good electrical conductivity
$(iii)$ Ductility
$(iv)$ High melting point

What is the melting point of sulfur (in $K$)?

Which metal exists in a liquid state at room temperature?

Which of the following metals is the lightest?

Out of the $114$ elements discovered so far,how many elements do not behave as metals?