* Electronegativity: Chlorine (Cl) is much more electronegative than hydrogen (H). This means chlorine has a stronger pull on shared electrons.

* Unequal Sharing: The shared electrons in the HCl bond spend more time closer to the chlorine atom, creating a partial negative charge (δ-) on the chlorine and a partial positive charge (δ+) on the hydrogen.

* Polarity: This uneven distribution of charge makes the HCl molecule polar.

Let me know if you'd like more details about covalent bonds or electronegativity!