Valency and Element X:
Element X has a valency of 3, which means it can form compounds with other elements by either gaining or losing 3 electrons.

Chloride of Element X:
When element X reacts with chlorine, it will form a compound known as XCl3. Since element X has a valency of 3, it will combine with three chloride ions (Cl-) to achieve a stable electronic configuration. Therefore, the chloride of element X is XCl3.

Sulphide of Element X:
Similarly, when element X reacts with sulphur, it will form a compound called XS3. Element X will combine with three sulphide ions (S2-) to balance the charge and achieve stability. Hence, the sulphide of element X is XS3.

In summary, the chloride of element X is XCl3 and the sulphide of element X is XS3. These compounds are formed based on the valency of element X, which determines the number of electrons it can gain or lose in chemical reactions.