This is a bit of a tricky question because "lime" can refer to two different things:

* Lime juice: Lime juice is primarily water (H₂O) with some citric acid (C₆H₈O₇) and other compounds. The number of atoms in a molecule of lime juice would vary greatly depending on which molecule you're looking at.

* Calcium oxide (CaO): This is the chemical compound that is commonly called "quicklime." It has 3 atoms: 1 calcium atom and 1 oxygen atom.

So, the answer depends on what kind of "lime" you're asking about!