The term "tetrachloride" is not a specific chemical compound. It's a prefix that indicates the presence of four chlorine atoms in a compound. To determine the valency, we need the specific element or group that is bonded to the four chlorine atoms.

For example:

* Carbon tetrachloride (CCl₄): Here, the valency of carbon is 4 because it bonds with four chlorine atoms (each having a valency of 1).

* Silicon tetrachloride (SiCl₄): Similar to carbon, the valency of silicon is 4 in this compound.

Therefore, you need to specify the element or group along with "tetrachloride" to determine the valency.