A(n) bond forms between a hydrogen atom with a partial positive charge on one molecule and another atom, such as oxygen, with a partial negative charge on an adjacent molecule.

The bond you're referring to is known as a Hydrogen bond. Here's how it forms, step by step:

1. A molecule contains a hydrogen atom bonded to a highly electronegative atom (like nitrogen, oxygen, or fluorine). This electronegative atom pulls the electron cloud closer to itself, creating a partial negative charge on it and a partial positive charge on the hydrogen atom.

2. This polarized hydrogen atom is then attracted to another electronegative atom on an adjacent molecule. This atom could be oxygen, nitrogen, or fluorine.

3. The attraction between the partially positive hydrogen atom and the partially negative atom (oxygen, nitrogen, or fluorine) on the adjacent molecule forms a hydrogen bond.

This type of bond is weaker than a covalent bond but stronger than a van der Waals interaction. It plays a crucial role in the structure of water and biological molecules like proteins and DNA.