* Hydrogen Bonding: Water (H₂O) molecules can form strong hydrogen bonds with each other. These bonds are due to the high electronegativity of oxygen, which attracts electrons away from the hydrogen atoms, creating a partial positive charge on the hydrogens and a partial negative charge on the oxygen. The strong attraction between these opposite charges results in strong hydrogen bonds.

* Weaker Intermolecular Forces in H₂Se: Hydrogen selenide (H₂Se) has weaker intermolecular forces. While it can form dipole-dipole interactions, these are significantly weaker than hydrogen bonds. The larger size of selenium compared to oxygen means the electronegativity difference is smaller, leading to weaker partial charges and weaker intermolecular forces.

Boiling Point Summary:

* Higher Boiling Point: H₂O (due to strong hydrogen bonding)

* Lower Boiling Point: H₂Se (due to weaker dipole-dipole interactions)