There's a slight mistake in your question! It's asking about protons and neutrons, not protons and americium. Americium is a different element altogether.

Here's the breakdown for radium:

* Protons: The number of protons defines an element. Radium (Ra) has 88 protons.

* Neutrons: The number of neutrons can vary, leading to different isotopes of the same element. The most common isotope of radium, radium-226, has 138 neutrons.

Let me know if you have any other questions!