Question

No of free electron in outermost shell of carbon atoms in a diamond

Answer 1

As we know that diamond is a poor conductor of electricity.

This property shows that there is no any free electrons in its outter most shell.

And it is extremely unreactive.

Answer 2

There is no number free electron in outermost shell of carbon atoms in diamond. That's why it is hardest substance in the world and do not conduct electricity.