# Question #3b6cf

##### 1 Answer

The Bohr model **does** apply to

#### Explanation:

The Bohr model applies only to a hydrogen atom or to ions that contain only one electron (hydrogen-like ions).

To get a hydrogen-like ion, we must remove **all but one** of the electrons from an atom.

Such ions include

They do not include

**Why doesn't the model work for multi-electron atoms?**

If the species had two electrons, the mathematical calculations would have to include a term representing the repulsions between the electrons.

This makes the equations extremely difficult to solve, and they are next to impossible with three or more electrons.

Thus, we cannot apply the equations of the Bohr model to any other atom.