# If you were to make a scale model of the hydrogen atom and decided the nucleus was to have a diameter of 1mm, what would the diameter of the entire model be?

##### 1 Answer

May 19, 2016

The diameter of the entire model would be 6 m.

#### Explanation:

The diameter of a proton is

The **Bohr radius** — the most probable distance from the nucleus to the electron — is

The diameter of a hydrogen atom is therefore

That is,

If the diameter of the model nucleus is 1 mm, then