Why are metals good conductors of electricity while non-metals are not ?

Give reasons for the following : (i) Metals are good conductors of electricity whereas non-metals are not. (ii) Ionic compounds have usually high melting and boiling points.

Give scientific reasons: Metals are good conductors of electricity while non-metlas are bad conductors of electricity.

Why metals are good conductors of heat ?

Why are the alkali metals good conductor of electricity?

Why are metals good conductions of heat and electricity?

Based on band theory, explain why metals are good conductors of electricity, while insulators are non-conductors of electricity.

Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason.