Answer: Zero
Step-by-step explanation:
Recall that Hund's rule states that every orbital must be singly filled before pairing occurs.
In CCl4, The configuration of carbon is 1s2, 2s2 2p2, Chlorine is 1s2, 2s2 2p5
Thus, the four electrons in carbon spread out in the second energy level and will be completely paired with the four lone outermost electrons of each of the chlorine atoms. Hence, CCl4 gives a tetrahedral structure, and have zero non-bonding domains.