Question

Pure sodium $\left(Na\right)$ is a good conductor of electricity because the $3s$ and $3p$ atomic bands overlap to form a partially filled conduction band. By contrast the ionic sodium chloride $\left(NaCl\right)$ crystal is :

• A. Insulator
• B. Conductor
• C. Semiconductor
• D. None of these

Answer 1

The correct option is A Insulator

The $N{a}^{+}$ & $C{l}^{-}$ both have noble gas electronic configuration. So, $NaCl$ won't allow electricity to pass through it. So, $NaCl$ is insulator in crystal state.