If two atoms are bonded to a central atom with no lone pairs, they will be placed linearly with a bond angle of 180 degrees.

Here's why:

* Electron Pair Repulsion: The electron pairs in the bonds repel each other, and they try to get as far apart as possible.

* Minimizing Repulsion: In a linear arrangement, the two electron pairs (from the bonds) are on opposite sides of the central atom, maximizing the distance between them and minimizing repulsion.

Example:

* Carbon dioxide (CO2) has a central carbon atom bonded to two oxygen atoms. There are no lone pairs on the carbon atom. The molecule is linear.

Let me know if you'd like to explore other molecular geometries!