Why NaCl does not conduct electricity in solid state?

1. The problem statement, all variables and given/known data
The title

2. Relevant equations

3. The attempt at a solution
It has no free moving ions or electrons

Then, my teacher saw the electrons and gave 0 marks to the question(It was on the test paper)

He said that if he didn’t see electrons there, he would have given a mark.
Why? I don’t understand.

If it does not have free moving ions but have free moving electrons, then it will conduct. My answer should not be wrong!


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