What will be the formula and the nature of bonding of its chloride of an element X placed in group 14?

X belongs to group 14, which indicates it has 4 valencies, while chlorine has 1 valency. So, four Cl atoms can covalently bond with one X atom. 

Each Cl atom takes a single electron from the X atom to get a stable configuration. Similarly, the X atom uses four Cl atoms and completes its octet. So, the formula of the compound will be XCl₄.
The bond formed by the mutual sharing of electrons between X and Cl atoms is called a covalent bond.
Hence, the element X will form a covalent chloride, XCl₄.