Silicon is $......$

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

Give reasons: Platinum,gold,and silver are used to make jewellery.

Provide one exception for each of the following general statements:
$(i)$ Metals are lustrous.
$(ii)$ Metals are solids at room temperature.
$(iii)$ Metals have high melting points.
$(iv)$ Non-metals are non-lustrous.
$(v)$ Non-metals are insulators or non-conductors of electricity.

Which non-metal element is a conductor of electricity?

Which non-metal element exists in a liquid state at room temperature?