Which network solid is an exceptionally good conductor of electricity?

Good conductor of electricity is:

Metals are good conductor of electricity. Give reasons.

Which type of crystalline solids are good conductor of electricity ?

Fill in the blank and rewrite the whole statement. A non-metal which shines like a metal and good conductor of electricity is ……………

Solid NaCl is bad conductor of electricity because :

Crystals which are good conductor of heat and electricity are -