Here's why:

* Bonding: Hydrogen chloride forms a single covalent bond between a hydrogen atom (H) and a chlorine atom (Cl).

* Electronegativity: Chlorine is much more electronegative than hydrogen. This means it attracts the shared electrons in the bond more strongly, creating a partial negative charge on the chlorine atom (δ-) and a partial positive charge on the hydrogen atom (δ+).

* Polarity: The unequal sharing of electrons creates a polar covalent bond. The molecule has a dipole moment, with the positive end pointing towards the hydrogen atom.

* Linear Geometry: Since there are only two atoms involved in the bond, the molecule can only exist in a straight line.

Representation:

* Lewis Structure: H - Cl

* Ball-and-stick model: A straight line with a hydrogen atom on one end and a chlorine atom on the other.

Let me know if you have any other questions.